单项选择题

Only when you have obtained sufficient data ______ come to a sound conclusion.

A. can you
B. you can
C. would you
D. you would

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单项选择题

I left rny pen on the desk and now it’s gone; who ______ it

A. took
B. has taken
C. will take
D. had taken

单项选择题

lf you ______ my advice, you ______ your failure now. You ______ your victory.

A. took ... wouldn’t cry over ... would celebrate
B. had taken ... wouldn’t have cried over ... would have celebrated
C. had taken ... aren’t crying over ... are celebrating
D. had taken ... wouldn’t be crying over ... would be celebrating

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