单项选择题

I am doubtful __________ he is still alive．

A．that
B．whether
C．what
D．when
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单项选择题
We did not find __________ to prepare for the worst conditions we might face．
A．it worth
B．it worthy
C．it worthwhile
D．worth our while
单项选择题
When he bent over to untie his shoelace，the __________ of his trousers split．
A．seam
B．joint
C．seat
D．edge
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