单项选择题
My brother （）college for over three years.
A. has gone to
B. has been to
C. has been in
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A. has; been; has gone
B. has; gone; has been
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You ______ me waiting for two hours. I ______ for you since five.
A. kept; waited
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单项选择题
John ______ there since 1998, so he ______ them.
A. has worked; knows
B. had worked; had known
C. had worked; knew
