题目内容
Mike!Can you hear someone ________ at the door?
[ ]
A.knock
B.to knock
C.knocking
D.is knocking
答案:C
解析:
解析:
|
hear sb.knock at the door听见某人敲门了;hear sb.knocking at the door听见某人在敲门.根据本句的语境判断. |
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