Doctors___(encourage)to perform operations that were impossible in the past
题目
Doctors___(encourage)to perform operations that were impossible in the past
答案
are encouraged
用过去式,be encouraged to do sth 被鼓励去做某事
医生们被鼓励去做以前不可能的手术.
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．
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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