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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单项选择题
Clients are invited to write______ call for additional information.
A． but
B． or
C． not
D． either
单项选择题
Mr. Goa ______the proposal before he looked at the guidelines.
A． writes
B． had written
C． has written
D． will write
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