(英语单选)Afteraboutthirtyyearsofno
Afteraboutthirtyyearsofnodirectflights,_____USpassengerplaneleftSanFrancisco,CaliforniaonThursdayfor_____HoChiMinhCity,VietNam.
A.a;不填B.the;不填C.a;theD.the;the
说一下这些属于什么情况?
Arehumanbeings_____toflytothesuninaspaceship?
A.probableB.likelyC.possibleDimpossible
D应该可以排除,我选的B,讨论一下前三个?
Heoftenwastedhistimedrawingsomepictureswhenhe_____somethingthat_____him.
A.shouldbedoing;hasgiven
B.shouldhavebeendoing;wasgiven
C.shoulddo;wasgiven
D.shouldhavebeendoing;hadgiven
我认为第二个是wasgiven,选了B,do,shouldbedone,shouldhavebeendoing都是表示什么啊?
自助者天助!