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【单选题】

______ is necessary for people to develop strong bones and teeth.
A．That calcium

B．Calcium
C．It is calcium
D．Although calcium
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根据网考网移动考试中心的统计，该试题：

34%的考友选择了A选项

57%的考友选择了B选项

2%的考友选择了C选项

7%的考友选择了D选项

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