Question

【题目】—There's a sign "Be quiet" on the wall of the reading room.

—Yes. People ________ talk loudly in public.

A. may not B. mustn't C. couldn't D. needn't

Answer 1

【答案】B

【解析】

试题分析：句意：-在阅览室的墙上有一个“安静”的标志。-是的。禁止人们大声说话。may not不可以；mustn't 禁止，不允许；couldn't不能；needn't不必。所以选B。