—There's someone knocking on the door．Who it be?
—It must be Mary．She promised to be here at 8：00．
| A．must | B．can | C．shall | D．need |
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—There's someone knocking on the door．Who it be?
—It must be Mary．She promised to be here at 8：00．
| A．must | B．can | C．shall | D．need |
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