Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is made from the given cues in each of the following questions.

Câu hỏi

They / not / sure / how / operate / new system.

A. They’re not sure how operating the new system.

B. They’re not sure how to operating the new system.

C. They’re not sure how to operate the new system.

D. They’re not sure how operate the new system.

Ôn thi vào lớp 10 _ Đề số 8 (tập 2)