________, follow the directions on the bottle carefully.A、When taken drugsB、Whe

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问题 ________, follow the directions on the bottle carefully.

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

答案 B

解析本题考查时间状语从句的变形。本句从句部分为when引导的时间状态从句，在语意明确的情况下，可以省略动作发出者，变化成when+doing结构。故选B。

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