问题描述：
The book is borrowed from the library .You ___your children put dots and
lines here and there.
A.shouldn’t be letting B.needn’t have let
C.ought not to have let to D.mustn’t have let
为什么
lines here and there.
A.shouldn’t be letting B.needn’t have let
C.ought not to have let to D.mustn’t have let
为什么
问题解答：
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