Last week my brother broke his leg[]basketball. A playing B

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Last week my brother broke his leg[]basketball. A playing B was playing
为什么不选B,求详细解答,O(∩_∩)O谢谢!

句中前面部分Last week my brother broke his leg已经是一个完整的句子,而后面的A 选项的playing basketball 应该是动词的现在分词短语做伴随状态的补语,表示是在打篮球的时候腿受的伤.
而B 选项的 was playing 是be动词加动词的现在分词是表示的动作正在进行.而且此be动在句中缺乏其相对应的主语.
希望能够帮助你,有问题可以直接向我提问,欢迎~

Last week my brother broke his leg[]basketball. A playing B last week john fell and broke his leg. I broke my leg last week.改为一般疑问句 He broke his right leg ______ he was playing football.A、sa B he b----his leg last week ---Mark broke his leg when he was playing football. My brother had a bad cold last week,and so _____.A.did I B.h My brother ______ ( not like) playing basketball 修改句子I leg broke last Friday my My brother likes playing basketball in his free time(就划线部分提问对My brother is playing basketball with his friends.进行提问 I d.to college this morning.He b.his leg last week.