Tricky Parallelism

[tarina]

1. Only seven people this century have been killed by the great white shark, the man-eater of the movies-less than those killed by bee stings.
A movies-less than those
B movies-fewer than have been
C movies, which is less than those
D movies, a number lower than the people
E movies, fewer than the ones

OA E
Anyway, I'm gonna talk about the "have been" in option B. See another one,

2. A surge in new home sales and a drop in weekly unemployment claims suggest that the economy might not be as weak as some analysts previously thought.

A claims suggest that the economy might not be as weak as some analysts previously thought
B claims suggests that the economy might not be so weak as some analysts have previously thought
C claims suggest that the economy might not be as weak as have been previously thought by some analysts
D claims, suggesting about the economy that it might not be so weak as previously thought by some analysts
E claims, suggesting the economy might not be as weak as previously thought to be by some analysts

OA A
Slightly different from Option C in term "have been".

Is such parallelism wrong?

[beat_gmat_09]

1. Only seven people this century have been killed by the great white shark, the man-eater of the movies-less than those killed by bee stings.
A movies-less than those
B movies-fewer than have been
C movies, which is less than those
D movies, a number lower than the people
E movies, fewer than the ones

OA E
Anyway, I'm gonna talk about the "have been" in option B. See another one,

2. A surge in new home sales and a drop in weekly unemployment claims suggest that the economy might not be as weak as some analysts previously thought.

A claims suggest that the economy might not be as weak as some analysts previously thought
B claims suggests that the economy might not be so weak as some analysts have previously thought
C claims suggest that the economy might not be as weak as have been previously thought by some analysts
D claims, suggesting about the economy that it might not be so weak as previously thought by some analysts
E claims, suggesting the economy might not be as weak as previously thought to be by some analysts

OA A
Slightly different from Option C in term "have been".

Is such parallelism wrong?

I dont see any parallelism here (specif 2), parallel structures tested in GMAT are - either by listing series of things or comparing or contrasting dfferent things, generally nouns (position), verbs are words which are supposed to be parallel.
The second ques typically tests subject-verb-agree (option B), tenses (option C) modifier (option D and E)
only A is a good fit.

Do you have official explaintaion for parallelism ?

[tarina]

I dont see any parallelism here (specif 2), parallel structures tested in GMAT are - either by listing series of things or comparing or contrasting dfferent things, generally nouns (position), verbs are words which are supposed to be parallel.
The second ques typically tests subject-verb-agree (option B), tenses (option C) modifier (option D and E)
only A is a good fit.

Do you have official explaintaion for parallelism ?

To correct that, they're comparison rather than parallelism.
If you compare A with B, A and B must be of one type, whether they're nouns or verbs.

Let's have a look at Q1:
In Option B, "have been" killed by bee stings is compared with "have been" killed by the shark.
Yet, in option D there's nothing to compare with" have been"
Q2:
In option C, economy might not be as weak as have been previously thought. Comparison between two verbs---"be" and "have been".

Have I made myself clear?

[beat_gmat_09]

I got your point of comparisons and their parallelisms,
i doubt that gmat tests them on helping verbs (be,have), have never seen so far.