问题
选择题
If you _________ someone or get in his way, you should say "Excuse me" or "I'm sorry". [ ]
A. knock into
B. knock at
C. knock on
D. knock
答案
A
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If you _________ someone or get in his way, you should say "Excuse me" or "I'm sorry". [ ]
A. knock into
B. knock at
C. knock on
D. knock
A