【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(yǔ)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(yǔ),表主動(dòng); B. taken, 過(guò)去分詞表被動(dòng),常做定語(yǔ);C. to take,不定式表目的,通常做目的狀語(yǔ);D. to be taken,不定式的被動(dòng)形式。句意:通常來(lái)說(shuō),當(dāng)按照說(shuō)明服用,藥是沒(méi)有副作用的。when 引導(dǎo)的句子主語(yǔ)與主句主語(yǔ)不一致,故從句要用非謂語(yǔ),而the drug與take 之間是被動(dòng)的關(guān)系,故用take的過(guò)去分詞形式。故選B。

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