单项选择题

Those present at the meeting put forward suggestions to solve the problem of office security.

A． Right
B． Wrong
C． Doesn't say
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单项选择题
Some important documents had been missing.
A． Right
B． Wrong
C． Doesn't say
单项选择题
Miss Lu was absent because she was ill.
A． Right
B． Wrong
C． Doesn't say
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