1.Not having worked out the problem,_________leave the office.( 。
A.so he was not allowed toB.and he didn't want to
C.the teacher couldn't make himD.he couldn't free himself to

分析 沒有把問題解決,他不能隨便離開辦公室.

解答 答案:D句中有逗號(hào)分隔,前面是現(xiàn)在分詞作原因狀語(yǔ),不是句子,因此后面不能用連詞,可排除AB;現(xiàn)在分詞短語(yǔ)having worked out與主語(yǔ)要構(gòu)成主謂關(guān)系,從句意可以看出解決問題的不是老師,而是he,故選D.

點(diǎn)評(píng) 現(xiàn)在分詞是非謂語(yǔ)動(dòng)詞的一種,表達(dá)主動(dòng)或進(jìn)行;過去分詞表達(dá)被動(dòng)或完成;動(dòng)詞不定式表達(dá)未發(fā)生的動(dòng)作.學(xué)習(xí)時(shí),要注意區(qū)分和掌握.

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