This warning sign indicates that you __ step on the grass

Câu hỏi :

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

A. shouldn't

B. mustn't

C. don't have to

D. ought not to

* Đáp án

B

* Hướng dẫn giải

Đáp án B

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