-Where's Mary?-Sorry.I ．( )A．not knowB．am not knowC．don't know 题目和参考答案——青夏教育精英家教网—

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4．-Where's Mary？-Sorry，I______．（　　）

A．

not know

B．

am not know

C．

don't know

分析 --玛丽在哪？
--对不起，我不知道．

解答答案：C．考查否定句．句意"--玛丽在哪？--对不起，我不知道．"，know实义动词，主语是I，一般现在时态，变否定在实义动词前加don't．答案是C．

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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