In the last twenty years, seven Canadian scientists _____ the Nobel prize! 
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A
won
B
had won
C
was winning
D
have won
推荐题目
--Have you seen Tony recently? --No, but I ________ dinner with him on Sunday.
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A
would have
B
have had
C
have been having
D
am having
By the time Jack returned home from America, his son __________ from college.
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A
graduate
B
has graduated
C
had graduated
D
had been graduated
Since the opening and reform policy, China    a boom in its economy.
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A
enjoys
B
has been enjoying
C
enjoyed
D
having enjoyed