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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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