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问题: 大学英语2 阶段作业3 系列问题18 需给出详细解释

18.The driver of the red car________when a black one came up very quickly.
A.was just starting
B.has just started
C.would just start out
D.is just starting out

解答:

A be+ING 表将来
从came看出是对过去的描述 所以用was