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【单选题】

The crewman switched on portable flashlights as the engineer __ the scene.
A．has surveyed

B． surveys
C．was surveying
D．is surveying
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参考答案：

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根据网考网移动考试中心的统计，该试题：

15%的考友选择了A选项

29%的考友选择了B选项

51%的考友选择了C选项

5%的考友选择了D选项

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