单项选择题

The question is worth ______ again.

A．discussing
B．to discuss
C．discussed
D．discuss
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单项选择题
______ they change the coach, they will lose the match.
A．Until
B．Before
C．Unless
D．Although
单项选择题
Either of the students ______ able to dance and sing.
A．be
B．are
C．is
D．have been
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