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3道英语单选求解释(词汇辨析类)

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3道英语单选求解释(词汇辨析类)
1.The talks might____for weeks before any concrete result is announced.A)press on B)drag on C)get bogged down D)hold out答案是B,为啥C不对呢?
2.I will hold you personally___if anything goes wrong in this project.
A)desructive B)lucrative C)diverse D)responsible答案是D,没看懂这句话...
3.A firm might sometimes sell at a loss to drive a competitor out of business,and___increase its market power.
A)therefore B)thereby C)hence D)further选B,请问therefore与thereby的区别
1.drag on 拖延;get bogged down 陷入泥沼动弹不得.
2.如果出了什么问题,我要你个人负责.
3.therefore 因此,前面说原因,之后得出结论,用这个单词.如:I have no money.Therefore I can't buy you a big house.而thereby的意思是“就这样;用这种方法”的意思.