单项选择题

In 2006, she was elected______chairman of the Student Union.

A. an
B. a
C. \
D. the
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I saw Mr.Zhang a moment ago. He______to Germany.
A. can't go

B. couldn't have gone
C. mustn't go

D. mustn't have gone
单项选择题
Documents______with chemicals will not become yellow with age.
A. treating
B. be treated
C. treats
D. treated
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