用that 或if或 whether造一个宾语从句
题目
用that 或if或 whether造一个宾语从句
答案
1.I think that it is easy for you to make sentences using these words.2.She doesn't know whether he will come or not.3.Please tell me if we will go to the park tomorrow.
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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