-I must apologize for ahead of time． -That’s all right． [ ] A． letting you not k
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![-I must apologize for ahead of time． -That’s all right． [ ] A． letting you not k](/pic/43_909634.jpg)
－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
试题答案
答案：B
解析：介词for后用动名词,否定在动名词前加not。