单项选择题

Ms. Silva sent the memo ______ it had been approved.

A． so
B． but
C． after
D． until
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单项选择题
______ our office, Mr. James voted against the proposal.
A． Representation
B． Representative
C． Representing
D． Representative of
单项选择题
The award was contested by one of the______.
A． competitors
B． competition
C． competing
D． competitive
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