单项选择题

Who ______how many offices we have contacted for the survey

A． knows
B． know
C． is knowing
D． are knowing
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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
单项选择题
Ms. Ravi has already conducted market research ______two new products.
A． around
B． from
C． on
D． near
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