—Listen! There is a knock on the door．Who _____ it be?
—It must be Jack．Just now I sent for him．
| A．shall | B．can | C．must | D．might |
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—Listen! There is a knock on the door．Who _____ it be?
—It must be Jack．Just now I sent for him．
| A．shall | B．can | C．must | D．might |
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