单项选择题

Where ______ Bob ______ To the library. He ______ there for an hour.

A. has; been; has gone
B. has; gone; has been
C. did; go; went
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单项选择题
You ______ me waiting for two hours. I ______ for you since five.
A. kept; waited
B. have kept; have waited
C. kept; have waited
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
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