Dave's ESL Cafe's Student Discussion Forums

[jasonlulu_2000]

Someone has come knocking at his door, door, door.
But who and what ________ there he is not sure, sure, sure.
A. stand B. stands

The answer given is B.

I think who and what refers to two different things or beings. The answer should be A. Am I right?

Thanks

[pugachevV]

Stands is the correct answer. You have to refer to the original "someone". It is singular ( some one.