Generally speaking, _______ according to the directions, the drug has no side effect.
A．if takingB．if takenC．if to takeD．if being taken
B
考查分詞用法。Take與drug構(gòu)成被動關(guān)系，所以使用過去分詞。句意：一般說來，如果按照說明服用，這種藥物是沒有副作用的。
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