This improvement meant that the exposure time was reduced to only a______of second in bright light.

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问题 This improvement meant that the exposure time was reduced to only a______of second in bright light.

选项 A、fracture
B、number
C、segment
D、fraction

答案D

解析 fraction“小部分,一点”;fracture“骨折,折断”;number“数字”,a number of后面接复数名词;segment“段,片,节,部分”,用在句中明显不合句意。
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