单项选择题

It is ______ useful (有用的) dictionary.

A．a
B．/
C．an
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单项选择题
You look very beautiful in this skirt.
A．That's right
B．No, I am not
C．Thank you
单项选择题
I don't know ______ we can finish the work on time.
A．that
B．if
C．when
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