He was walking along the river he heard someone shouting “Help . A. while B. when C. since D. until 题目和参考答案——青夏教育精英家教网—

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11. He was walking along the river he heard someone shouting “Help”.

A. while B. when

C. since D. until

11. B分析句意知，听到有人喊救命时，他正在河边散步，此处应为when或while引导的时间状语从句；while后只能接表示持续性动作的动词，而从句中hear为短暂性动词，故选B.

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