问题
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He promised me a letter; he ought to ______ it days ago.A.have writtenB.writeC.had written
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As an undergraduate, you ought to behave in_____with school regulations.A.conformationB.co
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I______to him because he phoned me shortly afterwards.A.ought to have writtenB.couldn"t ha
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When a college student decides to be a graduate student after graduation, he/she will face
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It is advisable that he ________ a seat in the train to Beijing.A may reserveB ought to
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He certainly ought to be ()(提升).