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。
Thebackgardenofourhousecontainsalawn，____verypleasanttositoninsummer.
Wecanhear____fromthebackoftheroom.
Ifnot_____withtherespecthefeelsduetohim,Jackgetsveryill-temperedandgrumblesallthetime.
I never regretted _____ his offer, for it was not where my interest lay.
It is imperative that students _____ their term papers on time.
