As a law graduate, he ought to know that eyewitness______ is notoriously unreliable, espec

He promised me a letter; he ought to ______ it days ago.A．have writtenB．writeC．had written

As an undergraduate, you ought to behave in_____with school regulations.A．conformationB．co

I______to him because he phoned me shortly afterwards.A．ought to have writtenB．couldn"t ha

When a college student decides to be a graduate student after graduation, he／she will face

It is advisable that he ________ a seat in the train to Beijing.A may reserveB ought to

He certainly ought to be ()(提升).