______it said that he is not to be trusted A.Often I heard B.Often did I hear C.Often have I heard
题目
______it said that he is not to be trusted A.Often I heard B.Often did I hear C.Often have I heard
答案
C.Often have I heard
倒装句,现在完成时态,听人们说他不能相信,是过去对现在一直产生影响
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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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