单项选择题

If you ______a touch-tone phone, you won't need an operator.

A． had
B． are having
C． have
D． will have
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单项选择题
Ms. Ravi has already conducted market research ______two new products.
A． around
B． from
C． on
D． near
单项选择题
Clients are invited to write______ call for additional information.
A． but
B． or
C． not
D． either
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