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    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】

    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。

    考点：考查定语从句

     

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