题目内容
9. 一I must apologize_____ you know ahead of time．
一That’s all right．
A．for letting not B．for not letting
C．to let not D．not to let
B
解析:
不定式或动名词的否定式均须在其前面加not，never，可先排除A、C两项。动词apologize后要接for短语，常用：apologize to sb．for doing／having done sth．，不能接动词不定式。故选B.
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