He fell off the bike ________. A．while ...

He fell off the bike ________.

A．while he rode	B．while he was riding
C．while he is riding	D．while on bike

B 【解析】本题主要考查的是while 引导的时间状语从句，一般而言，主句的动作发生在从句之中，故从句要用进行时态，故选B

考点分析：

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