John's score on the test is the highest in the class ; he____last night.
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musthavedone这一句型结构。
John'sscoreonthetestisthehighestintheclass;he____lastnight.
Theteachers’union_________alawsuitagainstthedistrictcallingforrepairing“deplorable”schoolconditions.
Theopeningceremonyisagreatoccasion.Itisessential_____forthat.
Itisnotuncommonforthere_____problemsofcommunicationbetweentheoldandtheyoung.
______isnotaseriousdisadvantageinlife.