50.The year 2002 _____ great changes in Shanghai’s landscape.
A.sees B.has seen C.saw D.had seen
49.I received an invitation ____ John’s wedding, but I haven’t decided whether to accept it.
A.for B.about C.to D.on
48.My sister _____ the league last month and she has decided to _____ the activities to help the aged in town next week.
A.joined; join in B.took part in; attend
C.joined; involve D.joined in; join in
47.– The window is dirty.
– I know. It _____ for weeks.
A.hasn’t cleaned B.didn’t clean C.wasn’t cleaned D.hasn’t been cleaned
46.______ the temperature falling so rapidly, we couldn’t go on with the experiment.
A.With B.For C.As D.Since
45.He ____ football regularly for many years when he was young.
A.was playing B.played C.has played D.plays
44.He accidentally ________ he had quarreled with his wife and that he hadn’t been home for a couple of weeks.
A.let out B.took care C.made sure D.made out
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