Who vs Whom

[neerajkumar1_1]

Once the audience had filed out, Serge began to wonder who, if anyone, had listened to his long speech.
A. began to wonder who, if anyone, had listened to his long speech.
B. began wondering whom, if anyone, had listened to his long speech.
C. began wondering whom, if anyone, listens to his long speech.
D. began to wonder who, if anyone, was listening to his long speech.
E. began wondering who, if anyone, was listening to his long speech.

[spoiler]OA:A[/spoiler]

Personally i use subject / object rule to differentiate between who and whom.
On reading the sentence, I feel Serge is the subject, but i got the answer wrong... Please let me know the correct usage of who or whom... thanks..

[adi_800]

Correct answer having two past perfects...Thats strange on GMAT...
we have first past perfect at the start of the sentence -> Had filed n then again followed by had listened...
For this reason I eliminated A n thats the right answer..

N we dont require past continuous tense for this one..
Can u let us know the source of the problem...

[neerajkumar1_1]

800score

[frank1]

who is correct
and it describes two things that happened in the past
so
had.....had
may be if there was
past progressive ....was/were would have fit...

[ansumania]

will someone pl. explain in detail why do we use past perfect here ?

how do we know whether to use past perfect or past progressive?