单项选择题
John（）to be a teacher before the war, but now he works in a hospital.
A.is used
B.was used
C.used
D.use
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A.–（不填）
B.up
C.on
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A.bring up
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Must we hand in our homework now?（）
A.Yes, you will
B.Yes, you mustn‘t
C.No, you needn‘t
D.No, you mustn‘t
