They are all new comers and don't realize ________ to do the job well.

They are all new comers and don't realize ________ to do the job well.

A.what takes it

B.what they take

C.what takes them

D.what it takes

答案及解析： D

解析：

一要考虑用陈述句语序，二要考虑it在宾语从句中作形式主语。