TODAY MANY SERIOUS CHILDHOOD DISEASES …………. BY EARLY IMMUNIZATION....

18. - KIEM TRA GUA KY 1 2010 2011
Lớp 12 Tiếng Anh KIEM TRA GUA KY 1 2010 2011

18. Today many serious childhood diseases …………. by early immunization.

A. are preventing

B. can prevent

C. prevent

D. can be prevented