5．I don't know why the manager didn't reply．He ________ not have received our letter．（　�。�
A．mustB．shouldC．needD．might

分析 我不知道為什么經(jīng)理不回復，他可能還沒有收到我們的信．

解答 答案：D
解析：A：一定；B：應該（should not have done意為"本不應該做某事，而實際卻做了"）；C：需要；D：或許；可能．根據(jù)句意"我不知道為什么經(jīng)理不回復，他可能還沒有收到我們的信"及所給選項分析可知，本題答案為D選項；其余選項均不符合題意．

點評 本題考查情態(tài)動詞的辨析，做此類題題目時一定要清楚各個選項的含義及用法，再結合句意及其它要求選出最終答案．

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