题目内容
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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