I usually go to school by / baIk / on weekdays.A. bookB. bikeC. backD. bank

问题补充：

I usually go to school by / baIk / on weekdays.

A. book

B. bike

C. back

D. bank

答案：

A. book

(答案→)B. bike

C. back

D. bank

解析：句意：在工作日我经常骑自行车去上学。根据句意和音标，故选B。