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I must apologize for________ ahead of time.” “It doesn't

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I must apologize for________ ahead of time.” “It doesn't
matter.”
A.letting you not know
B.not letting you know
C.not letting you to know
D.letting you not know
【精析与答案】 B.求详解
I must apologize for________ ahead of time.” “It doesn't
1.apologize for 后接动词ing形式.
2.let后面的动词只能是原形.
3.not是放在行为动词前用的.