I don't know _____if she's coming. [ ]A. at certain B. for certain C. with certain D. on certain -高中英语-n多题

◎ 题干

I don't know _____ if she's coming.

[ ]

A. at certain
B. for certain
C. with certain
D. on certain

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◎ 解析

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◎ 知识点

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