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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
考查情態(tài)動詞。ought not to have done本不應當做某事。句意：——書借自圖書館，你本不應當讓孩子用臟手碰它�！獙Σ黄稹�
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