______ , follow the directions on the bottle carefully.

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问题 ______ , follow the directions on the bottle carefully.

选项 A、When taken drugs
B、When drugs are taken
C、When one takes drugs
D、When taking drugs

答案D

解析本题测试分词用法。现在分词taking的逻辑主语为后面句子即祈使句中隐含的 you。故答案为表示主动的现在分词。本句大意为；服药时请仔细参照瓶上的说明。

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