Only when­­­­­­­­­­­­­­­­­___________ according to the directions can the medicine be quite effective.
A．takingB．takenC．being takenD．having been taken
B

試題分析：句意：只有當按照說明被服用這個藥才能非常有效。這里用了狀語從句的省略，完整的是only when the medicine is taken according to the directions can…，當主從句的主語一致的時候，可以省略從句的主語和be動詞，所以選B。
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