How can you expect to get good grades ___ you never listen attentively in class? A. while B. when C. as long as D. though为什么选B而不是A?

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How can you expect to get good grades ___ you never listen attentively in class?   A. while        B. when            C. as long as      D. though为什么选B而不是A?

How can you expect to get good grades ___ you never listen attentively in class? A. while B. when C. as long as D. though为什么选B而不是A?
How can you expect to get good grades ___ you never listen attentively in class?
A. while B. when C. as long as D. though
为什么选B而不是A?

How can you expect to get good grades ___ you never listen attentively in class? A. while B. when C. as long as D. though为什么选B而不是A?
答案:选B.How can you expect to get good grades _when__ you never listen attentively in class?
解析:while和when在表示“当.的时候”时基本可以互换,但是在这个句子中,when表示的是”如果,要是“的意思,而while则不能表示这个意思,所以这里只能用when.
翻译:要是你上课从未认真听过,你还想指望会有很好的成绩吗?
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when和while都可以表示“当什么时候”,但是当while表示当什么时候的时候通常放在句首,如果while放在句中,就表示转折。。。

when后面跟延续性或短暂性动词都可以,但是while只能跟延续性动词,listen 属于短暂性动词,所以选when.

while 尽管;when 既然,相当于now that,这是这两个词的特殊含义,牢记!