be supposed to do与was/were supposed to have done
题目
be supposed to do与was/were supposed to have done
区别
答案
be supposed to do 是指应该去做什么was/were supposed to have done 是指一种虚拟,是指本来应该做的,但是事实上并没有发生例如you were supposed to have finished the work,but i haven't seen it now...
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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．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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