— 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

試題分析：考查動(dòng)名詞否定形式。Apologize for sth因?yàn)閟th道歉；for是介詞，后面接動(dòng)名詞，動(dòng)名詞的否定形式在前面直接加Not。句意：我必須因?yàn)闆]有提前讓你知道向你道歉。故B正確。
點(diǎn)評(píng)：在所有的非謂語動(dòng)詞中，否定式都是在前面加Not，本題主要是句意的理解。
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