江西人教版选修六第五单元P35,butthisbeingmyfirstexperienceTHeothertwoclimbeddownintothecratertocollectsomelavaforlaterstudy,butthisbeingmyfirstexperience,Istayedatthetopandwatchedthem.but再接含逻辑主

　　江西人教版选修六第五单元P35,butthisbeingmyfirstexperience

　　THeothertwoclimbeddownintothecratertocollectsomelavaforlaterstudy,butthisbeingmyfirstexperience,Istayedatthetopandwatchedthem.

　　but再接含逻辑主语的非谓语动词结构跟我以前学习的知识有冲突,

　　21.Thesecretaryworkedlateintothenight,___B__alongspeechforthepresident.

　　22.Thesecretaryworkedlateintothenightand__C___alongspeechforthepresident.

　　A.toprepareB.preparingC.preparedD.prepare

　　23.There_A__sometroubleoverthisinthepast,Iwanttotreatthemattercarefully.

　　24.Becausethere_B__sometroubleoverthisinthepast,Iwanttotreatthemattercarefully.

　　A.beingB.wasC.hadbeenD.hasbeen