Nobody knows for sure how dinosaurs died out 65,000,000 years ago. It _______ because of sudden changes of their living conditions.

试卷相关题目

• 1No one ______ be more generous; he has a heart of gold.

  A.dare

  B.must

  C.could

  D.need

  开始考试点击查看答案
• 2The door _______ open, no matter how hard she pushed.

  A.shouldn’t

  B.couldn't

  C.wouldn't

  D.mightn't

  开始考试点击查看答案
• 3---- ________ you spoil everything, Kevin? ---- Please don't get me wrong. I just want to help and I am a good man and I ….

  A.Must

  B.May

  C.Can

  D.Will

  开始考试点击查看答案
• 4- You talk so much about London. You ________have been there. - Yeah, I went sightseeing on a tour last summer.

  A.must

  B.can

  C.will

  D.need

  开始考试点击查看答案
• 5—Tom is in low spirits today. He ______ again in the job interview. —What a pity! He has been greeted with bad luck these days. 

  A.could fail

  B.may fail

  C.must have failed

  D.must fail

  开始考试点击查看答案
• 6-- What's wrong with your pen? -- The ink ___________ come out.

  A.can't

  B.won't

  C.hasn't

  D.doesn't

  开始考试点击查看答案
• 7—Jack is not in the office at the moment —Oh, he ______ those who are going to take the driving test in an hour.

  A.can have instructed

  B.must have instructed

  C.must be instructing

  D.will be instructing

  开始考试点击查看答案
• 8It is important to know about the cultural differences that _________ cause problems.

  A.must

  B.dare

  C.shall

  D.may

  开始考试点击查看答案
• 9--- Mike, since you don't like to see the film with us, you _________ as well watch TV at home. --- OK, Mum.

  A.can

  B.will

  C.might

  D.must

  开始考试点击查看答案
• 10--- Do we have to hand in our research reports this afternoon, Professor Smith? --- Yes, you _______ . I will be waiting to check them all the afternoon.

  A.should

  B.may

  C.can

  D.must

  开始考试点击查看答案