单项选择题

Since you are free, why ______ it now

A．don't
B．doesn't
C．do not
D．not do
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单项选择题
It is hard to believe that Shanghai ______ so fast with each passing day.
A．is changed
B．should change
C．changed
D．has change
单项选择题
Even after the pop-star had made three curtain calls, the audience was still lingering with standing ovation and ______ not leave.
A．would
B．could
C．should
D．might
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