单项选择题

An answering machine takes messages ______Sundays.

A． from
B． at
C． in
D． on
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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
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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