3道英語單選求解釋（詞匯辨析類）
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,為啥C不對(duì)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,沒看懂這句話...
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選B,請(qǐng)問therefore與thereby的區(qū)別