A. | before | B. | when | C. | until | D. | since |
分析 眾所周知,當(dāng)冬天到來時,白天變得越來越短.
解答 答案:B 根據(jù)前文It is known to all that the day becomes shorter and shorter冬天到來時,白天變得越來越短.,before"在…之前";when"當(dāng)…時候";until"直到…為止";since"既然;由于".結(jié)合句意,此處應(yīng)指當(dāng)冬天到來時.故選B.
點評 while和when都是表示同時,到底句子中是用when還是while主要看從句和主句中所使用的動詞是短暫性動作(瞬時動詞)還是持續(xù)性動作.
1、若主句表示的是一個短暫性的動作,而從句表示的是一個持續(xù)性動作時,兩者都可用.如:
He fell asleep when[while]he was reading.他看書時睡著了.
I met him when[while]I was taking a walk in the park.我在公園散步時遇到了他.
2、若主、從句表示兩個同時進(jìn)行的持續(xù)性動作,且強(qiáng)調(diào)主句表示的動作延續(xù)到從句所指的整個時間,通常要用 while.如:
Don't talk while you're eating.吃飯時不要說話.
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