单项选择题

______ they change the coach, they will lose the match.

A．Until
B．Before
C．Unless
D．Although
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单项选择题
If you want to speak English well, you must practice it ______.
A．repeatedly
B．repeatingly
C．repeating
D．repeated
单项选择题
The question is worth ______ again.
A．discussing
B．to discuss
C．discussed
D．discuss
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