37.[1994全國(guó)]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
提示:

題目考察固定搭配“介詞 + 動(dòng)詞現(xiàn)在分詞”

 


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