The teacher made a request that all the homework ( ) before class.
题目
The teacher made a request that all the homework ( ) before class.
A.should hand in
B.must be handed in
C.were handed in
D.be handed in
答案
D啦.
it is suggested/ requested/ ordered/ insisted ---that
从句仍然要用虚拟+ (should) do
是虚拟语气的一种用法
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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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