--- It is strange that he ______ come so late.
--- Something unexpected must have happened to him.
A．shouldB．couldC．mustD．might
A
情態(tài)動(dòng)詞辨析。A. 應(yīng)該 ；不該 B. 能夠 C. 必須   D. 可能。句意：很奇怪，他不該來(lái)的這么晚�！隙òl(fā)生了什么不可預(yù)料的事情。故選A。
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