单项选择题

There was nothing that they could do______.

A．but wait
B．except waiting
C．only to wait
D．unless they wait
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单项选择题
—Have you found your pen yet —No, I am not sure______I could have done with it.
A．whether
B．where
C．when
D．what
单项选择题
Take this bag and______you can find enough space.
A．hang it which
B．hang it in which
C．hang it wherever
D．hang it where
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