YouthatlettertoJames.However，yodidn't（）.
B
「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。
Heleftordersthatnothing_____toucheduntilthepolicearrivedthere.
Ifasubstanceisdissolvedinwaterorheated，itmay（）agas.
_____theirhelp,wewouldnothavesucceeded.
Iwastohavemadeaspeechif_____.
Theeldestchildisthoroughly（）becausetheyalwaysgivehimwhateverhewant.