______, 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 takes drugs
D、When taking drugs

答案D

解析 选项部分没有出现主语,这样它的逻辑主语看做是后面句子的主语,而后面句子是第二人称祈使句,其主语是you,因此答案应该是表示主动的分词。
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