问题
选择题
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
答案
答案：C
考查固定结构。Knock on+window/door,敲门或敲窗户；as作为。我们敲人们的窗户，然后他们给我们糖果作为款待。选C。
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