【单选题】

The hourglass, an instrument used _________, usually consists of two bulbs united by a narrow neck.
A．( measures time

B．( time is measured
C．( for measuring time
D．( the time for measuring

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根据网考网移动考试中心的统计，该试题：

17%的考友选择了A选项

9%的考友选择了B选项

73%的考友选择了C选项

1%的考友选择了D选项

The hourglass, an instrument used _________, usually consists of two bulbs united by a narrow neck.A．( measures time