题目内容
I hope they will finish the project in time, but they themselves are very_____ that it will.
A. certain B. confident C. doubtful D. suspicious
C
解析:
doubtful doubtful about/of/that...“对……疑惑的,不肯定的”;
be confident“有信心的”;be certain of/about/ that“对……确定的”; be suspicious of/that“对有怀疑,有疑心的”
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