He fell off the bike ________.
A．while he rodeB．while he was riding
C．while he is ridingD．while on bike
B
本題主要考查的是while 引導的時間狀語從句，一般而言，主句的動作發(fā)生在從句之中，故從句要用進行時態(tài)，故選B
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