20.He is really nervous.He ______ back and forth all the night waiting for the results.( 。
A.had walkedB.has been walking
C.walkedD.is walking

分析 他很緊張.他整夜在來(lái)回地走,等待結(jié)果.

解答 答案是B.本題考查現(xiàn)在完成進(jìn)行時(shí).由第一句中的動(dòng)詞時(shí)態(tài)判斷說(shuō)明的是"現(xiàn)在的情況",所以排除A和C;現(xiàn)在完成進(jìn)行時(shí)表示表示從過(guò)去某時(shí)開始到現(xiàn)在這一段時(shí)間里一直延續(xù)著的動(dòng)作還在繼續(xù)進(jìn)行;本句不只是說(shuō)明現(xiàn)在在進(jìn)行中,而是說(shuō)明一整夜一直在來(lái)回地走,并且還在來(lái)回走動(dòng)中,故選B.

點(diǎn)評(píng) 完成進(jìn)行時(shí)的解題首先要理解其時(shí)態(tài)的基本用法--表示從過(guò)去某時(shí)開始到現(xiàn)在這一段時(shí)間里一直延續(xù)著的動(dòng)作,特別關(guān)注其"在進(jìn)行中"的特征;然后在語(yǔ)境中尋找動(dòng)作的時(shí)間依據(jù)進(jìn)行判斷.

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