Does Bob go to workbus or foot?A. to; byB. with; onC. by; onD. on; on

问题补充：

Does Bob go to workbus or foot?

A. to; by

B. with; on

C. by; on

D. on; on

答案：

A. to; by

B. with; on

(答案→)C. by; on

D. on; on

解析：在英文中，介词by后直接跟交通工具，而on foot为固定短语步行的含义，故本题选C。