15._ that they had made an important discovery in science.A.Little they realized B.They had realized littleC.Little did they realize D.Little had they realized 18. have I seen a better performance.A.Everywhere B.Nowhere else C.Everywhere else

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15._____ that they had made an important discovery in science.A.Little they realized B.They had realized littleC.Little did they realize D.Little had they realized 18.____ have I seen a better performance.A.Everywhere B.Nowhere else C.Everywhere else
15._____ that they had made an important discovery in science.
A.Little they realized B.They had realized little
C.Little did they realize D.Little had they realized
18.____ have I seen a better performance.
A.Everywhere B.Nowhere else
C.Everywhere else D.Nowhere
21._____the plane.
A.Flew down B.Down flew
C.Down was flying D.Down fly
23.______ I had time,I would have run round that lake again.
A.If B.Unless C.Had D.When
25.______ I would see you here.
A.Little I dreamed B.Little do I dream
C.I dreamed little D.Little did I dream
26.There ____ .
A.come they B.they come
C.they are come D.they will come
1.c 2.d 3.b.4.c 5.d 6.b

15._____ that they had made an important discovery in science.A.Little they realized B.They had realized littleC.Little did they realize D.Little had they realized 18.____ have I seen a better performance.A.Everywhere B.Nowhere else C.Everywhere else
15.因为little是一个表示否定意义的词,位于句首时要倒装；而realize意识到和make做出有一个时间先后顺序的问题,即realize是过去的动作,则make就是“过去的过去”的动作,所以,综合这两点,选择C
18.这句话的意思是：我从来没有看到过比这更好的演出了,凭语感就选D
21.又是一个倒装句,一般过去时态,飞机飞下来了,词组原形是fly down,所以选B
23.这是一个典型的虚拟语气句,即表示与过去的事实相反的虚拟语气句,主句谓语部分用would/could/should have done的形式,而if条件句的谓语部分则用had done的形式,再加上此处if条件句又是一种省略形式,所以选C,完整的表达应该是If I had had time
25.和15题道理相似,选择D
26.这是一种口语习惯表达,意思是“他们走过来了（从有点远的地方）”

15.little 否定词后面倒装，根据翻译可知道是过去式故选C 18.因为后面倒装故排除AC 又因为后面的A 所以选D
21.明显排除A 因为主语是单数所以排除D C是地点方位副词提前倒装类似于 here comes the bus,错故选B， 23：该句子是省略的条件状语从句选C 25：明显排除AC 分析可知明显是过去式选D 26：貌似是特殊搭配就好比Here ...

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