2. 外语
  3. The hourglass, an instrument used ______, usually consists of two bulbs united by a narrow neck.

The hourglass, an instrument used ______, usually consists of two bulbs united by a narrow neck.

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问题 The hourglass, an instrument used ______, usually consists of two bulbs united by a narrow neck.
选项 A、measures time
B、time is measured
C、for measuring time
D、the time for measuring
答案C
解析
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