【单选题】

Mary's bedroom is clean and clear, while her brother's bedroom is always ______.
A．at six and seven

B．at sixes and sevens
C．at sixth and seventh
D．at sixths and sevenths

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根据网考网移动考试中心的统计，该试题：

11%的考友选择了A选项

59%的考友选择了B选项

25%的考友选择了C选项

5%的考友选择了D选项

Mary's bedroom is clean and clear, while her brother's bedroom is always ______.A．at six and seven