问题
选择题
He fell off the bike ________.
A．while he rode
B．while he was riding
C．while he is riding
D．while on bike
答案
答案：B
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
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He fell off the bike ________.
A．while he rode
B．while he was riding
C．while he is riding
D．while on bike
答案：B
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