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Howtosolveit?Noreaderremoveabookfromthelibrarywithouttheconsentofthelibrarian.A.mayB.shouldC.mustD.shallWhichoneisright?Andwhy?Thanks!

题目详情
How to solve it?
No reader ____ remove a book from the library without the consent of the librarian.
A.may B.should C.must D.shall
Which one is right?And why?Thanks!
▼优质解答
答案和解析
D .第三人称是用shall 表示命令或 警告,我想这里是后者.