To __,only about five hundred people have travelled into space
题目
To __,only about five hundred people have travelled into space
To _____,only about five hundred people have travelled into space.
A.day B.date C.now D.nowadays
答案
选B To date 至今
怎么说呢,这是固定用法,A、C没有这种用法.如果要选D不要加to,直接是nowadays,而且nowadays只表示现在,没有“至”现在的意思
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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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