this is the second time she / improvement on that equipment; a:has made;
题目
this is the second time she / improvement on that equipment; a:has made;
答案
答案为has made
这是固定句型:this/it is the first/second/third...time+that-从句,意思是:第几次干某事.
在从句中要求用现在完成时.
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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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