求讲解.The first part of the 20th century saw more great inventions.二十世纪的第一部分可以看到更多伟大发明?主语是什么啊?

求讲解.The first part of the 20th century saw more great inventions.二十世纪的第一部分可以看到更多伟大发明?主语是什么啊? The first class beings ______ 8 o'clock. A.about B.for C. at （讲解） ^o^求讲解 求翻译,求讲解.Then came the time to part.这句话中有什么词组吗? jackson took part in the english contest and,____is more surprising,won the first place .求详解 tony took part in the high jump( )the first time tom was the first boy ()when you got there为什么填you talked to?求详细的讲解 the first person to do讲解 为什么用to do c为the first lesson希望有讲解, 请讲解一下For the first time 与 the first time的区别 求大神解释括号里的英语意思!The tricky part is whether that first sale doctrine applies to material both manufactured and first purchased outside the United States.（Breyer said it does:The upshot is that copyright-related consequences, ____ he took part in the competition,he won a second prize.A.For the first timeB.At a timeC.At one timeD.the first time 请问为什么选D,求详解,再谢! the water is an important part of our ____life 求仔细讲解 A every day B every days C everyday D everydays 讲解^O^. The students in our class__out-of-class activitiesA.take an active part in B.take active part in C.are actively in D.are active to答案是什么?求讲解 讲解first和at first的区别.（ ）he was afraid to take the airplane.A.First B.At first C.Firstly D.First time china took part in the Olympics for the first time in 1952(同义句转换) in the first part of the 19th century怎么翻译