Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

Câu hỏi

They propose that more vaccines __________ to curb the spread of the virus.

A. produce

B. produced

C. to be produced

D. be produced

Đáp án
D. be produced

Câu hỏi thuộc Bài tập:

VIP PLUS - ĐỀ SỐ 5