问题补充:
I go to school by , but my best friend goes there foot.
A. a bike; by
B. bikes; on
C. bike; on
D. bike; by
答案:
A. a bike; by
B. bikes; on
C. bike; on
D. bike; by
解析:句意:我骑自行车去上学,但是我的最好的朋友步行去上学。这里是固定短语by+表示交通工具的名词(用单数);所以应该是by bike;on foot步行。故选C。