问题补充:
It usually takes about ten minutes to school.
A. by bike
B. on a bike
C. to ride
D. ride
答案:
A. by bike
B. on a bike
(答案→)C. to ride
D. ride
解析:by在表示交通方式时,后面直接接交通工具ride是动词,骑。句意:骑车到学校通常花费大约十分钟的时间。强调句式 It is adj for sb to do sth,做某事对某人来说怎么样。本句中it是形式主语,指代后面不定式内容做形式主语,故选C。