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