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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．andB．isC．enjoysD．does

A．and
B．is
C．enjoys
D．does

单项选择题A．BecauseB．ForC．WhileD．When

A．Because
B．For
C．While
D．When