单项选择题

The question is ______ you can do it yourself.

A．whether
B．if
C．that
D．what
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单项选择题
I don't think I'll need any money but I'll bring some ______.
A．at last
B．in case
C．once again
D．in time
单项选择题
The professor ______ to America and he will give us a talk after he comes back.
A．has gone
B．has been
C．went
D．was going
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