3道英语单选求解释（词汇辨析类）1.Thetalksmight____forweeksbeforeanyconcreteresultisannounced.A)pressonB)dragonC)getboggeddownD)holdout答案是B,为啥C不对呢?2.Iwillholdyoupersonally___ifanythinggoeswrongin

　　3道英语单选求解释（词汇辨析类）

　　1.Thetalksmight____forweeksbeforeanyconcreteresultisannounced.A)pressonB)dragonC)getboggeddownD)holdout答案是B,为啥C不对呢?

　　2.Iwillholdyoupersonally___ifanythinggoeswronginthisproject.

　　A)desructiveB)lucrativeC)diverseD)responsible答案是D,没看懂这句话...

　　3.Afirmmightsometimessellatalosstodriveacompetitoroutofbusiness,and___increaseitsmarketpower.

　　A)thereforeB)therebyC)henceD)further选B,请问therefore与thereby的区别