题目内容
________ a car sped by and knocked him down.
A.As soon as B.The moment
C.All at once D.Once upon a time
C
考查作时间状语的短语。all at once 突然,相当于 suddenly; as soon as 当……时;the moment 一……就;once upon a time 从前,根据题意“一辆汽车突然冲出,将他撞倒。”,选择C。
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