YouthatlettertoJames.However，yodidn't（）.
A、oughttowriteB
「句意」 你本应该给詹姆斯写信，然而，你没写。
「难点」 ought to have written 是虚拟语气，与本句句意相符。
Heresented_____towait.Heexpectedtheminister_____himatonce.
Wecanhear____fromthebackoftheroom.
Ofcourse，（）mostimmigrantsdidnotgetrichovernight，buttheofthemwereeventuallyabletoimproveupontheirformerstandardofliving.
ProfessorJohnsonissaid_____somesignificantadvanceinhisresearchinthepastyears.
LastMarchthe__________ofa19thcenturycargoshipwasfoundbyanunderwaterarchaeologicalteam.
