brianlange77 wrote:

amysky_0205 wrote:Studying the fruit fly, a household nuisance but a time-honored experimental subject, has enabled the secrets of how embryos develop to begin to be unraveled by scientists.


A) Studying the fruit fly, a household nuisance but a time-honored experimental subject, has enabled the secrets of how embryos develop to begin to be unraveled by scientists.

B) By the study of the fruit fly, a household nuisance and also a time-honored experimental subject, it was possible for the secrets of how embryos develop to begin to be unraveled by scientists.

C) By studying a household nuisance but a time-honored experimental subject, the fruit fly enabled scientists to begin to unravel the secrets of how embryos develop.

D) By studying the fruit fly, a household nuisance and also a time-honored experimental subject, the secrets of how embryos develop are beginning to be unraveled by scientist.

E) The study of the fruit fly, a household nuisance but a time-honored experimental subject, has enabled scientist to begin to unravel the secrets of how embryos develop.

OA: E

I'm able to narrow down the answer to D and E.

But still don't know why D is wrong.

can someone explain?
thank u!

Amy,
Can you back and get the original question here -- I'm thinking there are some typos.. at least in D/E. Thanks.
-Brian