单项选择题

The orchestra（）for about ten minutes when a man in the audience suddenly began shouting.

A．was playing
B．had been played
C．had been playing
D．was played

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单项选择题
Tamara did not have time to go to the concert last night because she was busy（）for her lecture.

A．to preparing
B．to be prepared
C．preparing
D．being prepared
单项选择题
I wish I（）longer this morning, but I have to get up and come to class.

A．could have slept
B．slept
C．might have slept
D．have slept
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