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---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 letD.ought not to have let
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。
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