Only ________ according to the directions can the medicine be quite effective.
A．takingB．taken
C．being takenD．having been taken
B
選項(xiàng)動(dòng)詞的邏輯主語the medicine與動(dòng)詞take之間為被動(dòng)關(guān)系，實(shí)際上相當(dāng)于一個(gè)時(shí)間狀語從句only when it is taken...結(jié)構(gòu)，故應(yīng)選taken在句中用作狀語。
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