Because of carelessness , he fell off the bike ____ .

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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.

现在分词作伴随状语,并且现在分词的逻辑主语和句子的主语是同一个,所以用现在分词,表示主动.C中的时态不对,应该是过去进行时.

Because of carelessness , he fell off the bike ____ . The girl hurt her leg because she ____ her bike.A:fell off B He was ____(luck) that he fell off the bike yesterday. When he fell off the bike,he tried ____ but couldn't . Lilei fell off the bike,but ___(luck)he wasn t hurt ____(bad Because of his carelessness,he failed in the exam 填空 He fell off the bike and h____ himsekf. .he fell off the bike and was ()(bad,badly)hurt What ____yesterday evening?------He fell off the bike and hu while he ____(ride)his bike ,he fell off and broke his arm 填 he FELL of his bike off the bike fell the overjoyed boy