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 are used _________outdoors and under pressure.

A. to work

B. to be working

C. to working

D. Worked

Đáp án
C. to working

Câu hỏi thuộc Bài tập:

E9- Vào 10- Đề ôn 9