单项选择题

Everyone is busy working. You can't stay here ______ you keep quiet.

A．when
B．once
C．if
D．unless
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单项选择题
I first met Mary three years ago when we ______ in a middle school together.
A．have worked
B．had been working
C．were working
D．had worked
单项选择题
— Do you think the Stars will beat the Bulls— Yes. They have better players, so I ______ them to win.
A．hope
B．prefer
C．expect
D．want
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