题目内容
17.It is known to all that the day becomes shorter and shorter winter comes.( )| A. | before | B. | when | C. | until | D. | since |
分析 众所周知,当冬天到来时,白天变得越来越短.
解答 答案:B 根据前文It is known to all that the day becomes shorter and shorter冬天到来时,白天变得越来越短.,before"在…之前";when"当…时候";until"直到…为止";since"既然;由于".结合句意,此处应指当冬天到来时.故选B.
点评 while和when都是表示同时,到底句子中是用when还是while主要看从句和主句中所使用的动词是短暂性动作(瞬时动词)还是持续性动作.
1、若主句表示的是一个短暂性的动作,而从句表示的是一个持续性动作时,两者都可用.如:
He fell asleep when[while]he was reading.他看书时睡着了.
I met him when[while]I was taking a walk in the park.我在公园散步时遇到了他.
2、若主、从句表示两个同时进行的持续性动作,且强调主句表示的动作延续到从句所指的整个时间,通常要用 while.如:
Don't talk while you're eating.吃饭时不要说话.
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