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单项选择题

A．He must hand in a full report on the exhibition.
B．He is too busy to go along.
C．He has to wash his hands first.
D．He has already seen the show.
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单项选择题A．The library no longer had the book on reserve.B．The library closed earlier than he’ d expected.C．The professor had chosen a mystery book for him instead.D．The homework assignment isn’t clear.

A．The library no longer had the book on reserve.
B．The library closed earlier than he’ d expected.
C．The professor had chosen a mystery book for him instead.
D．The homework assignment isn’t clear.

单项选择题A．Science.B．Maths.C．History.D．Computer programming.

A．Science.
B．Maths.
C．History.
D．Computer programming.