6.---Look!The man at the gate _____ be our headmaster.He is always standing there every morning.
---No,it_______ be him.He is holding a meeting in the office now.( 。
A.must; can'tB.must; mustn'tC.can't; can'tD.can't; mustn't

分析 看!在大門口的那個男的一定是我們的校長.每天早上,他總是站在那.
--不,不可能是他.他現(xiàn)在正在他的辦公室開會.

解答 答案:A.
must一定,必須;mustn't不可以;can't不可能;根據(jù)本題的前句He is always standing there every morning,可知校長總是站在門旁,那么在門旁的那個人是校長的可能性很大,故用must;再根據(jù)He is holding a meeting in the office now,可知校長正在開會,那么在門旁的那個人不可能是校長,故用can't,表不可能.故選A.

點評 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的關(guān)鍵.

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