He was riding to school __ he was hit by a car this morning.为什么填when而不填while?

He was riding to school(_)he was hit by a car this morning怎么填 He was riding to schol__ he was hit by a car this morning.填连词 He was riding on without even looking round to see whether the old woman was he wents to bike riding on weenkend为什么用riding? he wents to bike riding on weenkend为什么用riding? 单选He was riding to school_________he was hit by a car.Awhile Bwhen Cfrom Dso单选He was riding to school_________he was hit by a car.AwhileBwhenCfromDso He was riding on without even looking round to see whether the old woman was all right. he wants to bike riding怎么翻译 He fell of the bike while riding还是while he was riding?是不是都对? He was riding to school __ he was hit by a car this morning.为什么填when而不填while? He was riding to school ---he was hit by a car this morning.A.while B.when C.as D.since 为什么 _____ he was riding to school,he was hit by a car this morning.A.Until B.Before C.AfterD.When答案是D.为什么 Simon was riding to school( )he was hit by car is morning.括号内为什么不能填while was riding 是可持续动词,hit是不可持续动词,as 和while应该都可吧? Simon was riding to school( )he was hit by car is morning.括号内为什么不能填while ?was riding 是可持续动词，hit是不可持续动词，as 和while应该都可吧？ he was riding to school ___he was hit by a car this morning Awhen Bwhile Cas D so要说明哦 Tom was so careless that he___his right arm when he was riding to school.A.hurts B.hurt C.has hurt D.had hurt求解析求答案! He ________ a bike to school when he was seven years old．A.ride B.riding C.rode D.tided My brother _________while he ________his bicycle and hurt himself.A.fell; was riding B.fell; were riding C.had fallen; rode D.had fallen; was riding