单项选择题

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
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单项选择题
Documents______with chemicals will not become yellow with age.
A. treating
B. be treated
C. treats
D. treated
单项选择题
______he was seriously ill, I wouldn't have told him the truth.
A. If I knew
B. Did I know
C. If I know
D. Had I known
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