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。
What actually __________ a good angle — or a good selfie overall — is rooted in what we consider beautiful.
To obtain a satisfactory result ， one must apply two____of paint on a clean surface.
Underthis____pressuresomeoftherocksevenbecameliquid.
______isnotaseriousdisadvantageinlife.
You that letter to James. However ，yo didn't（）.
