(单选题)

21.（）

A.while

B.when

C.unless

D.though

参考答案：B

参考解析：

考查时间状语从句。句意：贾雷特·利特尔（Jarrett Little）正在佐治亚州哥伦布郊外测试他的山地自行车时，他的骑行伙伴Chris Dixon突然停下来。此处表示“当Jarrett Little正在骑车的时候”，应用when；while表示“当……的时候”时，句中的谓语动词应为持续动词，不用短暂动词，而该句中的“stop”是短暂性动词，排除；其余两项意思不符合。故选B。

知识点：有选项完形填空英语专业基础知识完形填空教师招聘-小学英语

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