【題目】Generally speaking, _____ according to the directions, the drug has no side effect.

A. when taking B. when taken

C. when to take D. when to be taken

【答案】B

【解析】

試題分析：考查非謂語動(dòng)詞。由選項(xiàng)可知都有when,可以斷定when 連接從句。A. taking，現(xiàn)在分詞常做伴隨狀語，表主動(dòng)； B. taken， 過去分詞表被動(dòng)，常做定語；C. to take，不定式表目的，通常做目的狀語；D. to be taken，不定式的被動(dòng)形式。句意：通常來說，當(dāng)按照說明服用，藥是沒有副作用的。when 引導(dǎo)的句子主語與主句主語不一致，故從句要用非謂語，而the drug與take 之間是被動(dòng)的關(guān)系，故用take的過去分詞形式。故選B。

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