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

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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