It takes about 30 minutes a bicycle from my home to school.A. rideB. ridingC. to rideD.

问题补充：

It takes about 30 minutes a bicycle from my home to school.

A. ride

B. riding

C. to ride

D. rides

答案：

A. ride

B. riding

(答案→)C. to ride

D. rides

解析：句意：从家到学校骑自行车花费大约30分钟。It takes some time to do sth.做某事花费某人多长时间。 It是形式主语，to do sth.是真正的主语。故选C