问题
选择题
I'm sorry for _____ all your stationery on your desk. [ ]
A . knock down
B . knocking off
C. knocking on
D. knocked over
答案
答案：B
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I'm sorry for _____ all your stationery on your desk. [ ]
A . knock down
B . knocking off
C. knocking on
D. knocked over
答案：B