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I hope they will finish the project in time, but they themselves are very_____ that it will.
A.certainB.confidentC.doubtfulD.suspicious
C
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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