(Viên chức Mầm non) 600 câu trắc nghiệm Trọng tâm tiếng Anh có đáp án - Phần 28

Measles ______sometimes a serious disease. A. was B. were C. are D. is

19/30

Measles ______sometimes a serious disease. 

was

were

are

is

Giải thích

 Đáp án D