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...“對……疑惑的，不肯定的”；
be confident“有信心的”；be certain of/about/ that“對……確定的”; be suspicious of/that“對有懷疑，有疑心的”  
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