The boy sitting by the window is the only one student who ( ) from the country .
题目
The boy sitting by the window is the only one student who ( ) from the country .
A.is .were C.was D.are
答案
答案是A.is
who is from the country 做前面the only one student的定语
定语从句的时态一般要与主句的时态保持一致,所以选is而不是was
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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．
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