Walking on the grass in the park is not permitted.

A. You can walk on the grass in the park if you want to.

B. People like walking on the grass in the park.

C. We must not walk on the grass in the park.

D. We do not have to walk on the grass in the park.

Đáp án
C. We must not walk on the grass in the park.

Câu hỏi thuộc Bài tập:

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