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既会做题又会讲解的英语高手请进

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既会做题又会讲解的英语高手请进
Now that an agreement between the two sides has been reached,the matter canbe considered_________.A.to be settled B.to have been settled
_______all behavior is learned behavior is a basic assumption of social scientists.
A.That nearly B.Nearly C.When nearly D.It is nearly
He must have had an accident,or he __then.A.should be here B.would have been here
-Did you finish your work?
-No,I wasn't able to ,____you?
A.was B.do C.are D.were
第一题选B,to have been settled 是动词不定式的完成时形式,表示settled(解决)该动作发生在主句动作reached之前.意思是,既然双方达成了协议,这件事就可以认为被解决了.
第二题选A,that引导主语从句不可省略.所有行为都是学习行为是社会科学家们得基本看法.
第三题选B.would have done表示“本来要做但是没做”.意思:他一定是出事故了,不然他本来早该到了的.
第四题选D.were you是省略形式,完整为I wasn't able to,were you able to finish your work?
我不能完成,你能完成你的工作吗?
再问: 第三题为什么不能选A 如果改成should have done,是不是也可以。 我以后还有问题可以在来问你吗?