Just look at the clock!I _____ know it is so late now.

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Just look at the clock!I _____ know it is so late now.
A.don't B.didn't
应该选哪个?
请高手指教I didn't know 的用法

这个应该选B.
尽管从句采用的是一般现在时,但是要结合说话的语境,原句想要表达的意思是“我真不知道现在都这么晚了”.知道时间晚,是发生在看表之后的,原来不知道,现在知道了.
用法就像 i didn't recognize you.一样,当你说出这句话的时候,说明现在你已经认出他来了,只是刚才没认出来.
楼上的听着,怎么会没有 I don't know的说法呢!当你在表示现在不知道要怎么做的时候,当然用 i don't know了.比如有人问你一个问题,你不知道答案,你就可以说“ sorry,i don't know the answer”.这个都是要根据语言环境来的嘛!
上面的题之所以用didn't ,是因为它是对过去事实的否定,表示刚才不知道.

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