单项选择题

—I locked myself out of my apartment. I didn't know what to do.
—You may call your roommate.

A．could have called
B．might have called
C．would have called
D．must have called
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单项选择题
He painted his bedroom black. It looks dark and dreary. He should choose a different color.
A．had to choose
B．should have chosen
C．must have chosen
D．could have been choosing
单项选择题
The senior senator has in the past three terms both experienced the sweet taste of success and the bitterness of defeat in his legislation fights with his opponents.
A．both experiences
B．experiences both
C．experience both
D．experienced both
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