摘要： Listen ! Someone the door .
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Listen ! Someone ________ the door.
[ ]
A．knocks at
B．knock at
C．is knocking at
D．knocked on
---Listen! Someone is knocking at the door. Who _____it be?
---It _____be Tom. He phoned to visit me this evening.
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---It _____be Tom. He phoned to visit me this evening.
| A．may; may | B．may; shouldn’t | C．must; can | D．can; may |