_____ you 12 years old last year? yes, I _____ 13 years old this year.
题目
_____ you 12 years old last year? yes, I _____ 13 years old this year.
答案
were you 12 years old last year?yes,I am 13 years old this year.
前一空因为是last year,所以用过去式
后一空因为是 this year,所以用一般现在时
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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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