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50.The year 2002 _____ great changes in Shanghai’s landscape.

A.sees           B.has seen        C.saw           D.had seen

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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

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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

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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

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46.______ the temperature falling so rapidly, we couldn’t go on with the experiment.

    A.With          B.For           C.As            D.Since

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45.He ____ football regularly for many years when he was young.

A.was playing     B.played         C.has played      D.plays

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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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