单项选择题

--This is ______ useful book, I think.
-- So it is, and it's ______ unusual one.

A．a; a
B．a; an
C．an; an
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单项选择题
This class ______ now. Miss Gao teaches them.
A．are studying
B．is studying
C．be studying
单项选择题
Father asked Jack ______ he had stayed out so late.
A．how
B．when
C．why
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