So many directors___the board meeting had to be put off.
题目
So many directors___the board meeting had to be put off.
A)were absent B)been absent C)had been absent D)being absent
答案
选 D这里是用非谓语形式,因为这里不是复合句,即不是从句,所以同一个简单句里边不能容纳两个谓语形式存在,只能处理成非谓语形式.排除了 A和 C这两个是谓语形式.非谓语形式分为三种:现在分词(动名词)doing sth,表主...
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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.
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