How long__we take part in the college entrance examination?
题目
How long__we take part in the college entrance examination?
only less than 1 year
A is it since B will it be before C is it when D will it be since
答案
这道题应该选BIt +is/has been +时间段+since +从句(一般过去时)It+was +时间段+since +从句(过去完成时) 这两个句型的中文意思都是自从...以来有多久了It +will +be +时间段+before从句.意思是要过多久.才.It +b...
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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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