单项选择题

Please don’t __________ to ask me if you have any question．

A．pause
B．reserve
C．hesitate
D．mind
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单项选择题
It is not clear that he is __________ the trip．
A．enjoy
B．plan
C．on to
D．up to
单项选择题
I am doubtful __________ he is still alive．
A．that
B．whether
C．what
D．when
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