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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Either of the students ______ able to dance and sing.
A．be
B．are
C．is
D．have been
单项选择题
He apologized to his wife for having ______ her.
A．offended
B．protected
C．objected
D．defended
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