单项选择题

The headmaster ______ for more than two weeks.

A．has left
B．has gone
C．has been away
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单项选择题
—How long have you ______ there —About four years.
A．come
B．gone
C．worked
单项选择题
While she ______ TV in the sitting room, the bell
A．watches, rings
B．is watching, rang
C．was watching, rang
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