Since June 1st last year, all the supermarkets have _________ free plastic bags.

A. to stop to provide                B. to stop providing

C. stopped to provide                   D. stopped providing

Since June 1st last year, all the supermarkets have ________ free plastic bags．

1. A.
   to stop to provide
2. B.
   to stop providing
3. C.
   stopped to provide
4. D.
   stopped providing