The whole family were having their dinner with the door ______.
题目
The whole family were having their dinner with the door ______.
A.to be closed B.was closed C.closing D.closed
答案
D
with表示伴随,closed是形容词.
这句话谓语动词是have,一句话不能出现两个谓语动词,所以AB不对
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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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