I knew he collected stamps and coins and asked him whether his collection_____.
题目
I knew he collected stamps and coins and asked him whether his collection_____.
A.was growing b.was grown c.grew d.had been grown
答案
growing在这里表示"增加的状态"也就是问你收集的东西变多了吗?B被动不对,C主动变为成长,种植的意思,D也是被动不对
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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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