The two boys look alike very much. They ___ be twins.
题目
The two boys look alike very much. They ___ be twins.
A. mustn't B. can't C. must D. have to
我选的是C, 但答案是B,答案是不是错了?
答案
相信自己,就是答案错了
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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