| A. leaves B. left C. leave D. would leave
D 考察虚拟语气，would rather后面宾语从句要用过去时，表示虚拟语气，此句描述将来。
29. I don’t think Mary understood what you said, _____?
A. do I B. didn’t she C. did you D. did she
D 考察反意疑问句的用法
30. You _____ not have seen her yesterday, for she was abroad.
A. must B. should C. could D. would
C 情态动词的用法，表示对过去发生事情可能性的判断
31. Alice trusts you; only you can _____ her to give up the foolish idea.
A. suggest B. attract C. tempt D. persuade