问题
选择题
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
答案
答案：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” 