选什么:I must apologize for___ahead of time.
题目
选什么:I must apologize for___ahead of time.
(A)letting you not know
(B)not letting you know
(C)letting you know not
(D)letting not you know
答案
选B.
动名词的一般式的否定式是在动词前加not,not不能加在后面.
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