Only ______ according to the directions can the medicine be quite effective.

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问题 Only ______ according to the directions can the medicine be quite effective.

选项 A、taking
B、taken
C、being taken
D、having been taken

答案B

解析 句意为“The medicine can be quite effective only if it’s taken according to the directions”。主句为一般现在时,因此条件状语中需要使用一般现在时,可以排除[C],[D],主语为medicine,要用被动语态,可以排除[A]项,因此选择[B]。
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