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Taking this kind of medicine,if ___,will possibly do him gre

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Taking this kind of medicine,if ___,will possibly do him great harm.
A.to continue B.continued C.continuing D.having continued
选B.如果继续服这种药,很有可能对他有很大害处.
规律方法:
此题考查非谓语动词.if在这里引导的是条件状语从句,从句的主语是“服药”这件事,被省略了.根据句意可知“服药”这件事和continue成被动关系,所以这里用过去分词,选B.也就是:
If taking this kind of medicine is continued,taking this kind of medicine will do him great harm.
如果还有其他疑问,可以去“状元365”提问.