The supermarket provides customers plastic bags for free.A. onB. withC. ofD. in

问题补充：

The supermarket provides customers plastic bags for free.

A. on

B. with

C. of

D. in

答案：

A. on

(答案→)B. with

C. of

D. in

解析：考查介词：provide sb with sth=provide sth to sb表示给某人提供…句意：超市免费给顾客提供塑料袋。选B。