几道英语单选请注明原因和答案,谢1,Althoughtheuniverseseemsenormous,Ithinkithasa(n).A.orbitB.limitC.destinationD.length2.Wearebestfriends,butweeachotherforabouttenfearssincegraduation.A.didn'tseeB.have

Question

几道英语单选 请注明原因和答案,谢
1,Although the universe seems enormous,I think it has a(n) ____.
A.orbit B.limit C.destination D.length
2.We are best friends,but we ____ each other for about ten fears since graduation.
A.didn't see B.haven't seen C.hadn't seen
3.By the year 2020,I may have had ____ robot shaped like____ human in the house to help me with the housework.
A./;the B.a;the C.the;a D.a;a
4.____ himself well in public is his goal,but he hasn't quite mastered it yet.
A.To express B.Having expressed C.Express D.Expressed

Answer 1

参考答案：1.B(虽然宇宙似乎很浩瀚无垠,我想它是有限的,整句话就是这个意思.A是“轨道”,B是“有限”,C是“目的地”,D是“长度”)
2.B（因为有标识词since,这个词所在的句子一般用现在完成时）
3.B（拥有robot是泛指一个,所以用a;human是人类的意思,不能用a,只能用the）
4.A（表示目的,他的目标就是让自己出名）