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。
Toobtainasatisfactoryresult，onemustapplytwo（）ofpaintonacleansurface.
_____ at in this way, the present economic situation doesn't seem so gloomy.
If not _____with the respect he feels due to him, Jack gets very ill-tempered and grumbles all the time.
The eldest child is thoroughly（）because they always give him whatever he want.
This missile is designed so that once _____ nothing can be done to retrieve it.