Is it necessary to complete the design before the National Day?是什么意思Is (it ）necessary to complete the design before the National Day?括号里为什么用it不用this,that和he却用it顺便将这句话翻译一下

The indoor swimming pool seems to be a great deal more luxurious than ( )A is necessary ;B being necessary ;C to be necessary ;D it is necessary it is necessary for you to work Is it necessary to learn grammer It is necessary for sb to It is necessary to do 的例句 关于necessary.it is necessary to do sth.it is nec关于necessary. it is necessary to do sth. it is necessary to doing sth. 两者有什么区别?什么时候用to do .什么时候用 to doing?请回答, I find ( ) him all about it.A.necessary to tell B.that necessary to tell C.necessary it to tell D.it necessary to tell Change is not necessary to life,it is life it is clear that sleeping is necessary to everyone is it necessary to tell his father everything?此句用is that necessary 英语necessary的问题It is necessary for us to learn.可不可以改成We are necessary to learn His friends find____him everything that has happened A.it necessary to tell B.that necessary totell C.necessary it to tell D.necessary to tell It is necessary to protect trees from the frost.翻译 It is necessary to protect trees from the frost. It is necessary ( ) travellers to take a map when is it necessary to pass cet4 or cet6 in uiniversity It is necessary for you to take an X-ray. Why is it necessary to encourage a low carbon lifestyle?