Did you see the accident ________when you were walking past?

Did you see the accident ________when you were walking past?

题目
Did you see the accident ________when you were walking past?
A.to happen
B.happen
C.happened
D.is happening
选哪个,为什么
要专业,还有哪种情况和这个一样,举个例子.
答案
Did you see the accident ________when you were walking past?选B.happensee sb do sth 所以接原型happen
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