单项选择题

This is the second time that your mother has been to London, ______

A．isn't she
B．isn't it
C．has she
D．hasn't she
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单项选择题
—Who's the man talking to our teacher—A professor ______ a visit to our school.
A．pays
B．is paying
C．has paid
D．paying
单项选择题
______forever are the days ______ I was young.
A．Going; when
B．Gone; when
C．Go; then
D．Gone; then
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