1.The research is so designed that once ( )nothing can be done to change it.
1.The research is so designed that once ( )nothing can be done to change it.
A.begins B.having begun C.begun
2.Having a trip abroad is certainly good for the old couple,but it remains ( )whether they will enjoy it.
A.to see B.to be seen C.seeing D.seen
3.( )with the size of the whole earth ,the biggest ocean does not seem big at all.
A.compare B.comparing C.when compared
若把C中的WHEN去掉行吗?
4.i have no one ( )me,for i am a new comer here.
A.helping b.to help c.help
1.C
此题考查状语从句的省略：如果状语从句的主语是it或与主句主语相同,且从句的谓语动词以be动词开始,则可以把状语从句的主语和be动词省略.
即：Once begun = once it is begun.
2.B
固定句型“It remains to be seen + whether引导的从句”,意思是“...是否...还不得而知”.
再如：It remains to be seen whether you are right.你是否正确目前尚不得而知.
3.C
此题考点同第1题,即使用了状语从句的省略语法.
即：When compared with the size of the whole earth
= When the biggest ocean is compared with the size of the whole earth
另：如果去掉when,直接使用过去分词做状语,也是可以的.
4.B
固定搭配：have sb to do sth,意思是“有某人/物去做某事”或“有做某事的某人”.
再如：I have many workers to work at this project.
我有很多工人来做这项工程./ 我有很多做这项工程的工人.
此结构中的have意思是“有”,并非使役动词“使/让”之意.