摘要：knock on / at people’s doors
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We knock _____people’s doors, and they usually give us some candy _____ a treat.
A. on, to B, at, to C. on, as D. on, on
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We knock _____people’s doors, and they usually give us some candy _____ a treat.
A. on, to B, at, to C. on, as D. on, on
A. on, to B, at, to C. on, as D. on, on
We knock _____people’s doors, and they usually give us some candy _____ a treat
- A.on, to
- B., at, to
- C.on, as
- D.on, on