— There'ssomeone knocking on the door. Who _____it be?— It must be Mary. She pro

题干

— There'ssomeone knocking on the door. Who _____it be?
— It must be Mary. She promised to be here at 8：00.

A．must

B．need

C．shall

D．Can

上一题下一题 0.64难度单项选择更新时间:2013-10-15 04:37:33

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