题目内容

Only ______according to the directions can the medicine be quite effective.
A．takingB．takenC．being takenD．having been taken
B
考查分词用法。Medicine与take之间构成被动关系，所以使用过去分词的形式，C表示正在被服用；D表示已经被服用；句意：只有根据说明书服用，这个要才相当有效。
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