单项选择题
My brother （）college for over three years.
A. has gone toB. has been toC. has been in
单项选择题 Where ______ Bob ______ To the library. He ______ there for an hour.
单项选择题 You ______ me waiting for two hours. I ______ for you since five.
单项选择题 John ______ there since 1998, so he ______ them.
