we were walking along the river, we heard a cry for help.A．WhileB．UntilC．AfterD．Before 题目和参考答案——青夏教育精英家教网—

题目内容

_ we were walking along the river, we heard a cry for help.

A．While

B．Until

C．After

D．Before

解析试题分析：句意：当我们沿着河边走时，我们听到了求助声。while正当……时候。故选A。
考点：考查时间状语的用法。

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