题目内容
20.-Why you didn't handed in your exercise paper?-Sorry,but I ____ that it should be turned in today.( )
A. | didn't know | B. | hadn't known | C. | haven't known | D. | don't know |
分析 ---你为什么没有交你的练习纸?
---对不起,但是我不知道今天应该交.
解答 答案:A
根据对话的内容可知,他没交练习纸是因为以前他不知道要今天交,是现在刚知道,所以"不知道"这一状态,是发生在过去.故需要用一般过去时.B是过去完成时,本题中并没有说明"不知道"这一状态是发生在过去的过去;C现在完成时,这里"不知道"是发生在过去的状态但并没有强调对现在存在的影响或造成的结果.只是单纯地表达当时不知道.故选A
点评 一般过去时的句中通常有明显的表示过去的时间(yesterday;last year/week/month;a moment ago;just now等),或者有语境的提示,强调的只是过去发生的动作或状态.要注意它与现在完成时态的区别.
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