Question

They were the Boy Scouts ________ to help elderly people cross the streets．

1. A.
   whose was the work
2. B.
   to whom was the work
3. C.
   it was whose work
4. D.
   whose work it was

Answer 1

D
解析：
该题考查定语从句的用法。定语从句中的it为形式主语，真正的主语为后面的不定式部分，故答案为D项。