Question

【题目】It's a good idea to send the old books to the children ______need them.
A.which
B.who
C.what
D.where

Answer 1

【答案】B
【解析】句意：把旧书寄给那些需要的孩子是个好主意。A. which“哪一个”；B. who“谁”；C. what“什么”；D. where“哪里”。先行词是the children指人，定语从句用引导词who引导。故选B。