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
The French pianist who had been praised very highly ______ to be a great disappointment.
A．turned up
B．turned in
C．turned out
D．turned down
单项选择题
Although he knew little about the work done in the field of physics, he succeeded _____other experienced experts failed.
A．which
B．that
C．what
D．where
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