these chairs and desks are broken.they need___ a.to repair b.repairing c.repair d.repaired
题目
these chairs and desks are broken.they need___ a.to repair b.repairing c.repair d.repaired
答案
先弄清need 的用法‘ 物作主语时后接doing / to be done ,人作主语时后接to do .这里是物作主语,故用ING 形式,即B对
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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