题目内容
9.How old is Jackie?I _____ know.( )
| A. | am not | B. | not | C. | am | D. | don't |
分析 --杰基多大了?
--我不知道.
解答 答案:D.考查否定句.句意"--杰基多大了?--我不知道.".根据know知道,实义动词,可知否定句应该用助动词don't,答案是D.
点评 考查否定句.通常是在be动词,情态动词后加not.一般现在时态,主语不是第三人称单数用don't,主语是第三人称单数用doesn't.一般过去时态用didn't.还有其它用法需要牢记.
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