John'sscoreonthetestisthehighestintheclass;（）helastnight.
A、muststudyC
「句意」 约翰的考试分数全班最高;他昨天晚上一定学习了。
「难点」 表示对过去某一动作行为的猜测须要用must have done 这一句型结构。
I _____ the party much more if there hadn’t been quite such a crowd of people there.
The country’s chief exports are coal, cars and cotton goods, cars _____ the most important of these.
_____ at in this way, the situation doesn ’t seem so desperate.
Breadandbutter（）likedbyWesterners.
_____ your timely advice,I would never have known how to go about the work.
