单项选择题

（）computer is more essential to a modern business than （）typewriter.

A．The；the
B．/；/
C．A；the
D．The；a

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单项选择题
It was unusual for there （）so few students in the classroom.

A．to be
B．be
C．being
D．are
单项选择题
Henry felt so hungry that he ordered a double,（） of fish.

A．piece
B．part
C．portion
D．section
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