______the missing boy,they had to stay there for another two weeks.
题目
______the missing boy,they had to stay there for another two weeks.
A.Not finding B.Not found C.Not having found D.Having not found为何选C不选A
答案
Not finding 意思是 没有找(完全没有去找)
Not having found 是 没找到(又尝试过找,但没找到)
他们尝试去找那个失踪的小孩,没找到,所以要再呆在那儿两个星期.
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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