注意：此页面搜索的是所有试题
题目内容
（山东第一医科大学英语（4））
They are going downtown ______ bus instead of _____ their bikes.
A . by;by
B . on; by
C . by; in
D . by; on
A . by;by
B . on; by
C . by; in
D . by; on
参考答案