问题
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
答案
参考答案：C
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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
参考答案：C