I don't know _____if she's coming. [ ]A. at certain B. for certain C. with certain D. on c

题目简介

I don't know _____if she's coming. [ ]A. at certain B. for certain C. with certain D. on c

题目详情

I don't know _____ if she's coming.
[     ]
A. at certain
B. for certain
C. with certain
D. on certain
题型:单选题难度:中档来源:同步题

答案

B

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