— 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 |
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— 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 |
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