单项选择题

1 don't think it is any use ______ this matter any further.

A．discussing
B．to discuss
C．to discussing
D．to be discussed
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单项选择题
You will be late ______ you leave immediately.
A．unless
B．until
C．if
D．or
单项选择题
Please let us have more time,______
A．shall we
B．will you
C．won' t you
D．don' t you
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