He fell of the bike while riding还是while he was riding?是不是都对?

He fell of the bike while riding还是while he was riding?是不是都对? .he fell off the bike and was ()(bad,badly)hurt 填空 He fell off the bike and h____ himsekf. he fell into the arms of Morpheus he is the owner of this bike he ---- this bike Because of carelessness , he fell off the bike ____ .A.while he rode B. while riding C. while he is riding D. while on his bike 为什么选B,如何分析此题,请详解,谢谢. He fell off the bike .H ,he didn‘t hurt himself. When he fell off the bike,he got _____ and it was really hurt. He fell off the bike on his way home yesterday.L__ ,he didn't hurt badly He was ____(luck) that he fell off the bike yesterday.是unlucky还是unluckily?为什么 John fell off the bike in the race and he was hurt （ ）（bad）. He fell off his bike but he wasnt hurt.=He fell( )his bike but( )( )( )( ) U_______,he fell off the bike and hurt his legs beadly, Lilei fell off the bike,but ___(luck)he wasn t hurt ____(bad) He fell off his bike and hurt himself.=He fell off his bike and( )( ) per 是介词么？The cost of the trip is 10yuan ______personMr Davd saw the accident ____ when he was driving pastShe fell off the bike and was____ (bad)hurt yesterday per 是介词么?The cost of the trip is 10yuan ______personMr Davd saw the accident ____ when he was driving pastShe fell off the bike and was____ (bad)hurt yesterday John was so drunk that he fell off the bike and _______ by the roadside until the next morning.