The book is borrowed from the library .You ___your children put dots and
题目
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
答案
A.shouldn’t be letting 可以填 shouldn’t let.这里的进行时态是指always,一直不能这样.
如：He is always eating.含有告戒,警告等意思.
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
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