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（请给出正确答案）
His breathing was steady.
A:regular
B:usual
C:common
D:ordinary
B:usual
C:common
D:ordinary
参考答案
参考解析
解析：本句意思：他呼吸平稳。steady稳定的，匀速的。regular有规律的，间隙均匀的；usual通常的，常有的；common普通的，常见的；ordinary普通的，平常的。
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