He _____ without saying good-bye to them, for he always has good manners.
A．mustn’t have leftB．may not leaveC．shouldn’t have leftD．can’t have left
D
解本題一定要注意審題，要把題目看完整，才不會(huì)想當(dāng)然選C，根據(jù)后文的for he always has good manners可以斷定“他不可能不打招呼就離開(kāi)”，用can’t have left.
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