19.-There's a sign"Be quiet"on the wall of the reading room.
-Yes.People        talk loudly in public.( 。
A.may notB.mustn'tC.can'tD.needn't

分析 --閱覽室的墻上有一個"安靜"的標志.
--是的.在公共場合人們不可以大聲說話.

解答 答案:B.
may not可能不;mustn't不可以;can't不可能;needn't不必.根據(jù)There's a sign"Be quiet"on the wall of the reading room,可知閱覽室的墻上有一個"安靜"的標志,所以在公共場合人們不可以大聲說話.mustn't不可以,表禁止.故選B.

點評 本題考查了情態(tài)動詞的用法.熟知句意以及所給選項的意思是解答本題關(guān)鍵.

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