It is required that the machine be oiled as frequently as necessary
为什么用Be oiled而不用Must be oiled ,is oiled或者Will oil求详解
人气：287 ℃ 时间：2020-03-24 22:35:10
解答
本句为虚拟语气, 在这里require , suggest 用法是类似的,都是虚拟语气required 加从句要求从句that 主语+ （should）+谓语 所以这句话实际上是machine should be oiled as frequently as necessary句中恰恰省略...
推荐
猜你喜欢
- 解释 A person should be judge by his deeds ,not by his words.
- 在物理中Component是什么意思?
- 关于x、y的方程(x+2y)(x-y+1),求二次项,一次项,常数项是什么?
- 已知集合A ={x|x ＜1}1,B ={x |x ＞1},则A∩B=?
- 氧气与一氧化碳,一氧化碳与碳,碳与三氧化二铁能否反应
- He slept in the daytime and slept at night.中slept是过去式还是过去分词?
- 三个不同数之个等于它们之积,哪三个?
- 一件上衣进价为240元,后来按百分之十五的利润来定价,出售时打八折,则这件上衣的售价是
