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【单选题】

We are ______ to know what he means.
A.at a loss

B.at least
C.at once
D.at ease
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根据网考网移动考试中心的统计,该试题:

73%的考友选择了A选项

13%的考友选择了B选项

13%的考友选择了C选项

1%的考友选择了D选项

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