【They()forshanghaionFriday.shallwegotoseethemoffatthetrainstationAleftBwereleavingChaveleftDareleavingc为什么不可以Oldpeoplemust()AbespokentopolitelyBspeaktopoliteCbespokenpolitelyDspeakpolite那个to】

　　They()forshanghaionFriday.shallwegotoseethemoffatthetrainstation

　　AleftBwereleaving

　　ChaveleftDareleaving

　　c为什么不可以

　　Oldpeoplemust()

　　AbespokentopolitelyBspeaktopoliteCbespokenpolitelyDspeakpolite

　　那个to为什么要有啊?c为什么不可以

　　Itwas（）weatherthattheydecidetogooutforapicnic.

　　AsuchfineBsuchafine

　　为什么没有a

　　-Idonnothaveaparnertoplaytabletenniswith.

　　-why()asportclubtopractisealot?

　　Adon'tjoinBnotjoiningCnottojoinDdon'tyoujoin

　　not和whydon'tyou的区别

　　（）areyougongtowritethisstory

　　-aboutfivepages

　　AhowoftenBhowsoonChowlongDhowfast

　　howlong表时间为什么可以说明故事的长短,可以表具体吗?