情態動詞
a. can't be b. shouldn't be c. couldn't have been d. mustn't have been 20. tom ought not to me your secret, but he meant no harm. a. have told b. tell c. be telling d. having told 21. everyone is here. we start the meeting? a. can b. must c. should d. shall 22. i parked my car right here but now it's gone. it . a. must be stolen b. may be stolen c. must have stolen d. must have been stolen 23. he the work yesterday, but he didn't. a. must have finished b. need have finished c. finished d. should have finished 24. he did not pass the examination. as a good student, he . a. mustn't have failed b. may not have failed c. needn't have failed d. shouldn't have failed 25. it be true that albert passed the test in geography? a. may b. should c. could d. would 26. you lead a horse to the water but you not make it drink. a. will; can b. may; can c. may; dare d. dare; can 27. ─must we finish the composition in class? ─no, you . a. needn't b. mustn't c. won't d. shouldn't 28. her eyes were red. she . a. must cry b. must be cried c. must have been crying d. may cry 29. mary his letter, otherwise she would have replied before now. a. has received b. must receive c. couldn't have received d. shouldn't have received 30. i told sally how to get here, but perhaps i for her. a. had to write it out b. must have written it out c. should have written it out d. ought to write it out