【題目】— 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

【答案】B
【解析】句意：-在閱覽室的墻上有一個“安靜”的標志。-是的。禁止人們大聲說話。may not不可以;mustn't 禁止，不允許;couldn't不能;needn't不必。所以選B。

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