who has not been annoyed by ()from something interesting he really wants to hear?
题目
who has not been annoyed by ()from something interesting he really wants to hear?
A.his attention being taken
B.having his attention taken
C.taking his attention
D.having taken his attention
答案
B 注意力被打断.应该是被动语态.have sth done是某物被怎么样 的意思.
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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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