单项选择题

Nowadays, we do almost all our ______ by e-mail for business purposes.

A. connection
B. correspondence
C. contract
D. construction
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单项选择题
The ______ information concerning this project will be provided for your convenience.
A. specification
B. specifically
C. specific
D. specify
单项选择题
He must submit a concrete energy ______ that is to be carried out soon.
A. plan
B. planning
C. plans
D. planned
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