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[单选题]
A. usual B. useful C. just D. mistake
A.usual
B. useful
C. just
D. mistake
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.usual
B. useful
C. just
D. mistake
如果结果不匹配，请 联系老师 获取答案
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