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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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
单项选择题
The office manager wants the computers ______by tomorrow.
A． will be installed
B． installing
C． install
D． installed
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