I think it must have been in 1967 ____ I visited the Great Lake the first time.
题目
I think it must have been in 1967 ____ I visited the Great Lake the first time.
A:that
B:when
C:in which
D:where
答案
选a.the first time,所以必须用that
举一反三
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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