the musicians were to play jokes on each other 这句中为什么要加介词to?
题目
the musicians were to play jokes on each other 这句中为什么要加介词to?
答案
was/were + to 过去将来时am/is /are + to do sth一般将来时,表示按计划,约定将要发生的事情 eg:we are to meet at the school gate tomorrow morning. was/were +to do sth 过去将来时,表示在过去的时间来看,事情将...
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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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