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

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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
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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
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

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.

A.理由如下:
but前后为两个句子,则根据句子必须有主谓,可判定BD错误,C错是因为必须加冠词,即take a bus

我认为是A,BCD不要I应是对的,高手勿喷