John's score on the test is the highest in the class ; （）he last night.
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musthavedone这一句型结构。
I _____ the party much more if there hadn’t been quite such a crowd of people there.
At______,photographyisachemicalprocess,duringwhichalight-sensitivematerialisalteredwhenexposedtolight.
Modern____perhaps causes more problems than it solves.
The（） in Janet‘s character has hindered her froom advancement in her career.
_____enough time and money, the researchers would have been able to discover more in this field.
