助动词和情态动词
问题描述：
助动词和情态动词
并请说明原因
1."The interst____be divided into five parts,according to the agreement made by both sides,"declared the judge.
A.may B.should C.must D.shall
2.--I'll tell Mary about her new job tomorrow.
--You____her last week.
A.ought to tell B.would have told C.must tell D.should have told
3.--Who is the girl standing over there?
--Well,if you ____know,her name is Mabel.
A.may B.can C.must D Shall
答
1,D表示说话人的意图、允诺、警告、命令、决心等,用在条约、规章、法令等文件中表示义务或规定,都用shall
2,D should have done表示过去本来应该做某事而未做,句意：你本来上星期应该告诉她的.
3,C 如果你一定要知道的话,她是Mabel.