单项选择题

In my opinion, some important problems need_________.

A．discuss
B．being discussing
C．discussed
D．discussing
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_________you've got a chance, you might as well make full use of it.
A．After
B．Although
C．As soon as
D．Now that
单项选择题
We must get up early tomorrow, _________we will miss the 7 o'clock train to Beijing.
A．so
B．or
C．but
D．however
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