18．The students__________ their experiments when a stranger broke into the lab．（　�。�
A．had been doingB．have been doingC．would be doingD．were doing

分析 當(dāng)這個(gè)陌生人闖入實(shí)驗(yàn)室的時(shí)候，這些學(xué)生們正在做實(shí)驗(yàn)．

解答 答案：D．根據(jù)when a stranger broke into the lab可知當(dāng)這個(gè)陌生人闖入實(shí)驗(yàn)室的時(shí)候，這些學(xué)生們正在做實(shí)驗(yàn)，所以謂語(yǔ)動(dòng)詞do用過(guò)去進(jìn)行時(shí)，故答案為D．其他選項(xiàng)表示的時(shí)態(tài)分別是：A、過(guò)去完成進(jìn)行時(shí)  B、現(xiàn)在完成進(jìn)行時(shí)  C、過(guò)去將來(lái)進(jìn)行時(shí)．

點(diǎn)評(píng) 考查過(guò)去進(jìn)行時(shí)．過(guò)去進(jìn)行時(shí)表示過(guò)去的某個(gè)點(diǎn)正在進(jìn)行的動(dòng)作，而將來(lái)進(jìn)行時(shí)表示將來(lái)的某個(gè)點(diǎn)正在進(jìn)行的動(dòng)作．

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