--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 题目和参考答案——青夏教育精英家教网—

题目内容

--I must apologize for _______ ahead of time.

--That’s all right.

[　　]

A．letting you not know

B．not letting you know

C．letting you know not

D．letting not you know

答案：B
解析：

不定式、动名词、分词的否定式都在前面加not。

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