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— I must apologize for _____ ahead of time.
— That’s all right.
A.letting you not knowB.not letting you know
C.letting you know notD.letting not you know
B

试题分析:考查动名词否定形式。Apologize for sth因为sth道歉;for是介词,后面接动名词,动名词的否定形式在前面直接加Not。句意:我必须因为没有提前让你知道向你道歉。故B正确。
点评:在所有的非谓语动词中,否定式都是在前面加Not,本题主要是句意的理解。
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