I am writing to express my heartfelt gratitude. I am referring to that unfortunate accident the other day, when I was knocked ()my bike by a motorcycle.A、downB、offC、byD、with

I am writing to express my heartfelt gratitude. I am referring to that unfortunate accident the other day, when I was knocked ()my bike by a motorcycle.

A、down

B、off

C、by

D、with

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