He often rides a bike to school but I to my school.A. by bus B. on a busC. by a busD. ta

问题补充：

He often rides a bike to school , but I to my school.

A. by bus

B. on a bus

C. by a bus

D. take a bus

答案：

A. by bus

B. on a bus

C. by a bus

(答案→)D. take a bus

解析：本句子中缺少谓语，只有D能作谓语。故选D