Generally speaking, ________according to the directions, the medicine has no side effect.
A．when takenB．when takingC．when to takeD．when to be taken
A

試題分析：考查省略句。當狀語從句的主語和主句主語一致的時候，且含有be動詞的時候；可以把狀語從句的主語和be動詞一起省略。本題在when后面省略了the medicine is；句意：一般說來，當安裝說明來服藥的時候，藥是沒有副作用的。故A正確。
點評：當狀語從句的主語和主句主語一致的時候，且含有be動詞的時候；可以把狀語從句的主語和be動詞一起省略。
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