单项选择题

______ computer is more essential to a modem business than typewriter.

A．The, the
B．/, /
C．A, the
D．The, a
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单项选择题
A．viewedB．measuredC．gotD．found
A．viewed
B．measured
C．got
D．found
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
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