--Bob.You have posted those letters．--Sorry．I forgot it．( )A．canB．shouldC．mustD．may 题目和参考答案——青夏教育精英家教网—

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4．--Bob，You ________ have posted those letters．
--Sorry．I forgot it．（　　）

A．

can

B．

should

C．

must

D．

may

分析 --Bob，你本应该把那些信拿去邮寄了的．
--对不起，我忘了．

解答答案：B
解析：A：可能；B：应该；C：一定；D：或许．根据答句的"对不起，我忘了"可知上一句的句意为"你本应该把那些信拿去邮寄了的"，故结合所给选项分析可知本题答案为B选项（should have done 意为"本应该做某事，而实际未做"）．

点评本题考查情态动词的辨析，做此类题题目时一定要清楚各个选项的含义及用法，再结合句意及其它要求选出最终答案．

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