So difficult it to work out the problem that i dicided to ask Tom for advice.A I did find
题目
So difficult it to work out the problem that i dicided to ask Tom for advice.A I did find
B din i find C i have found D have i found
答案
b
程度副词so 放句首半倒装
有had i dound 这个选项也是可以的,但have不行是现在完成时对现在有影响都过去八辈子了,可以一般过去或过去完成时态
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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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