AThirteen hundred medical professionals, Ball of which have been trained to treat drug dependency, Cattended the annual conventi

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问题 AThirteen hundred medical professionals, Ball of which have been trained to treat drug dependency, Cattended the annual convention Dsponsored by a society.

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答案B错,应该改为“all of whom”。

解析 “all of…”引导的句子修饰的是前面的“medical professionals”,由于所修饰的是人,所以应该把“all of which”改为“all of whom”。
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