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。
Theteachers’union_________alawsuitagainstthedistrictcallingforrepairing“deplorable”schoolconditions.
Idon’tlike_____billsbutwhenIdogetthemIlike_____thempromptly.
_____atinthisway,thepresenteconomicsituationdoesn'tseemsogloomy.
Itisnotuncommonforthere_____problemsofcommunicationbetweentheoldandtheyoung.