1.Ann is very tired because she ___for hours.
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1.Ann is very tired because she ___for hours.
a.typed b.types c.is typing d.has been typing选c为什么不对?我知道正确答案,可我想知道为什么选C不对?
那选C代表什么?
a.typed b.types c.is typing d.has been typing选c为什么不对?我知道正确答案,可我想知道为什么选C不对?
那选C代表什么?
应该选D
C不对是因为时态不对,句子中应该是完成时,安非常疲倦,因为她已经打字打了几个小时。用C的话,就是安疲倦是因为正打字打了几个小时,说不通,有for hours 得句子,一般都是用完成时。
应用过去完成进行时,表过去一段时间里一直做
选d.has been typing
for hours表示一段时间并且持续到现在,这种行为对现在有影响故用现在完成时态
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