4.This item was not explained __ time.A. for lack B. lack C. for lack of D. lack of
题目
4.This item was not explained __ time.A. for lack B. lack C. for lack of D. lack of
答案
c
for indicates the reason.
lack of 是个词组
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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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