问题
选择题
---The book is borrowed from the library. You ____ your children touch it with their dirty hands.
---Sorry.
A．should have let
B．needn’t have let
C．mustn’t have let
D．ought not to have let
答案
答案：D
考查情态动词。ought not to have done本不应当做某事。句意：——书借自图书馆，你本不应当让孩子用脏手碰它。——对不起。