I usually come home by bike,but sometimes I( ) .a.walk b.on

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I usually come home by bike,but sometimes I( ) .a.walk b.on foot c.take bus d.by a bus
要理由的

答案：A
but连接的是两个完整的句子,所以括号里需要添加一个动词做谓语.
walk 可以做及物动词也可以做不及物动词,为正解；
on foot 是一个介词短语无法做谓语；
take bus 没有这种用法,一般的表达是take a bus 或者是take the bus;
by a bus 同样是一个借此短语无法做谓语.
所以,只有walk符合题意.

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