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

 

D

【解析】

試題分析：句意：在植物園玩得很高興的所有的游客都精疲力竭了。這里使用了定語從句，先行詞是the tourists，定語從句是由代詞all+介詞of+關系代詞引導的，因為先行詞是人，所以關系代詞用whom，選D。

考點：考查定語從句

 

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