What has puzzled the scientists most is that a slight change in its environment ____ have pushed the rare species over the edge into extinction.A.should B.shall C.would D.will

What has puzzled the scientists most is that a slight change in its environment ____ have pushed the rare species over the edge into extinction.A.should B.shall C.would D.will The shy boy appeared in the classroom,_____ his mother,who was leading him _____hand.A followed by…on his B followed…by Cfollowing…by the D following…by 选C _____is how he has collected so many stamps.A What I am puzzled B That I am puzzled No one has yet succeeded in explaining the ___ of how life began.A.problemB.causeC.puzzleD.logic With a ______ expression on her face,she is ______ about what to do next.A.puzzled; puzzling B.puzzling; puzzled C.puzzled; puzzled D.puzzling; puzzling 帮我分析一下这句话的语法结构 谢谢~~in the picture,a man has just bumped into the wall and wounded his nose,he seems puzzled by what had happened. 这句话里是完成时,为什么seems是现在时呢? What has the dog got? The fact puzzled John Smith much ________ he has been unable to pass the driving test up to now.A.why B.because C.how D.that Facing the __________ situation, the sales manager looked __________.A. puzzling; puzzled B. puzzling; puzzling C. puzzled; puzzled D. puzzled; puzzling The reason _ she gave for not coming to the party puzzled all of the people present.A.what B.why C.as D.which 为什么? puzzled by the problem that was put forward at the metting 为什么用puzzled不用puzzling the more he explained,the more I was puzzled —I'll ask the teacher about the subject clause.I'm very puzzled about it.—That's just_____most—I'll ask the teacher about the subject clause.I'm very puzzled about it.—That's just_____most of our classmates have doubt.A.what B.which C.where D What book has the most stirring chapters? What book has the most stirring chapters? - What has a headache the last week. puzzled和 puzzling 的区别14.The __ look on his face suggested ...14.The __ look on his face suggested that he didn't understand what the teacher said．A．puzzling B．surprising C．puzzled D.surprised when he heard the news,he stood there,( ).A.looked puzzled B.looking puzzled C.looed puzzling D.looking puzzling The youngest daughter got angry again.Mother felt very ___ and father’s face wore a ___ expression.A puzzled,puzzled B puzzling,puzzled C puzzling,puzzling D puzzled,puzzling