问题
选择题
It isn't quite ______ whether the teacher will collect the homework by Friday, so you needn't hurry.[ ]
A. sure
B. right
C. certain
D. exact
答案
答案：C
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It isn't quite ______ whether the teacher will collect the homework by Friday, so you needn't hurry.[ ]
A. sure
B. right
C. certain
D. exact
答案：C