He            a glass of milk just now. He was very careless.

A. knocked at
B. knocked on
C. knocked out
D. knocked off
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科目：初中英語 來源：0110 月考題 題型：單選題

He            a glass of milk just now. He was very careless.
[     ]
A. knocked at
B. knocked on
C. knocked out
D. knocked off

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