单项选择题

She ought to stop working; she has a headache because she（）too long.

A．has been reading
B．had read
C．is reading
D．read

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单项选择题

The librarian requires that all books（）returned before the last day of classes.

A．are
B．be
C．must be
D．would be

单项选择题

（）might be expected, the response to the question was very mixed.

A．That
B．It
C．As
D．What

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