单项选择题

There was nothing they could do ______.

A．but to wait
B．only to wait
C．but wait
D．unless they waited
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单项选择题
Are you______spending more money on the space program
A．in favor of
B．by favor of
C．in favor to
D．out of favor
单项选择题
He never wrote to his father______ he was in need of money.
A．except
B．except when
C．except for
D．except that
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