what they need at present ____(be)science and technology?why the answer is are
题目
what they need at present ____(be)science and technology?why the answer is are
sorry the answer is IS.Who can tell me why?
答案
what they need at present是主语从句,从句或某短语作主语时,谓语动词用单数形式
如:Doing exercises is good for our health.每天做早操对我们的健康有好处.
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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