2道英语单选1.He must have finished the work by the end of last mo

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2道英语单选
1.He must have finished the work by the end of last month,_____he?
A.mustn't B.hadn't C.didn't D.hasn't
2.Brian told you that there wasn't anyone in the room at that time,___________?
A.was there B.wasn't there C.didn't he D.did he
回答两题,并回答为什么这么选和如何解决这一类的问题,

D C

He must have finished the work by himself by the end of last they must have finished the work by the end of last month,__ he must have finished the work by the end of the month,____? I have promised to have the work finished by the end of this you must have the paper finished by the end of this month by the end of last 10.The new suspension bridge _________ by the end of last mo by the end of last month ,they had finished half of their wo ( )the end of next month they will have finished the work. By the end of next year they will have finished the new stad We must get the work finished _____ by tomorrow morning. Last week, he told me that by the end of the next term, he _