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21.______ before we leave the day after tomorrow, we should have a wonderful time together.
A.Had they arrived B.Would they arrive
C.Were they arriving D.Were they to arrive
22.______ last year and is now earning his living as an advertising agent.
A.He would leave school B.He left school
C.He had left school D.He has left school
23.Some people viewed the findings with caution, noting that a cause-and-effect relationship between passive smoking and cancer remained ______.
A.to be shown B.to have been shown
C.to have shown D.being shown
24.______ that should be given priority to.
A.It is the committee has decided
B.It is only the committee has decided
C.It is what the committee has decided
D.It is what has the committee decided
25.The most interesting new cars may owe ______ the simple wisdom of hiring a few talented people and allowing them to work.
A.less local free-spiritedness than
B.less local free-spiritedness than to
C.to less local free-spiritedness than to
D.less to local free-spiritedness than to
26.Over the years, Jimmy Connors ______ phenomenal displays of tennis and temperament at the US Open last week, he exhibited both again.
A.has treated spectators with B.has treated spectators for
C.has treated spectators D.has treated spectators to