-- How do you usually come to school?----I usually come to school .A. take the busB. by

问题补充：

---- How do you usually come to school?

----I usually come to school .

A. take the bus

B. by bus

C. by the bus

D. take a bus

答案：

A. take the bus

(答案→)B. by bus

C. by the bus

D. take a bus

解析：句意：----你通常是怎样来学校的？----我常常是坐公交车来学校。这里应用动词come/go+by+交通工具，表示怎样来去。因此，选B。