Only ______according to the directions can the medicine be quite effective.
A．takingB．takenC．being takenD．having been taken
B
考查分詞用法。Medicine與take之間構(gòu)成被動關(guān)系，所以使用過去分詞的形式，C表示正在被服用；D表示已經(jīng)被服用；句意：只有根據(jù)說明書服用，這個要才相當有效。
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