问题
选择题
The poor girl across the road a car knocked her down.
A．walked; while
B．walked; since
C．was walking; until
D．was walking; when
答案
答案：D
根据时间状语从句，从句的动作发生在主句动作之中，主句用进行时，而从句用一般过去时，故选D
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