Question

The tourists,        had enjoyed themselves so much in the botanic garden, were worn out

A．all of what

B．all of which

C．all of them

D．all of whom

Answer 1

D

试题分析：句意：在植物园玩得很高兴的所有的游客都精疲力竭了。这里使用了定语从句，先行词是the tourists，定语从句是由代词all+介词of+关系代词引导的，因为先行词是人，所以关系代词用whom，选D。