John'sscoreonthetestisthehighestintheclass;（）helastnight.
C
「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。
LastMarchthe__________ofa19thcenturycargoshipwasfoundbyanunderwaterarchaeologicalteam.
The opening ceremony is a great occasion. It is essential_____ for that.
ProfessorJohnsonissaid_____somesignificantadvanceinhisresearchinthepastyears.
_____ at in this way, the present economic situation doesn't seem so gloomy.
She hired a lawyer to investigate, only to learn that Gabriel had removed her name from the deed.The infinitive verb phrase “only to learn ” is used ____.