some / towns / and / countries / usually / become / overcrowded /with/ tourists / at /summer time /.

A. Some towns and countries usually become overcrowded in tourists at summer time.

B. Some towns and countries usually become overcrowded on tourists at summer time.

C. Some towns and countries usually become overcrowded with tourists at summer time.

D. Some towns and countries usually become overcrowded for tourists at summer time.

E9- TĐ- Test for Unit 8