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is应改为are
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单项选择题
A．Their appointment is not until tomorrow.B．The professor is waiting for their call.C．They should call the professor after the meeting.D．They should wait until the next day.
A．Their appointment is not until tomorrow.
B．The professor is waiting for their call.
C．They should call the professor after the meeting.
D．They should wait until the next day.
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