-I must apologize for______ahead of time. -That’s all right.

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问题 -I must apologize for______ahead of time. -That’s all right.

选项 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 本题考查介词后动词的否定形式。“—我必须为没有提前让你知道道歉。”“—没有关系”在介词for后加动词时要用其ing形式,表示否定时,否定词not放在动词的前面。
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