英语四级考试试题

十、情态动词1. In China even barren mountains_____ turned into fertile fields.A)can B) can be C) is able to D) is able to be2. At that time we thought the story_____ not be true.A)could B)was able C)is able D)must3. You_____ the work better.A)could did B)can have done C)could have done D)must did4. He_____ seen the film.A)might not have B)may not C)maybe not D)maybe has not5. Soldiers_____ obey orders.A)may B)can C)must D)need6. I mailed the letter two weeks ago. She_____ it .A)must receiv