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Safety goggles should be worn at all times______in testing areas.A、asB、whileC、
Safety goggles should be worn at all times______in testing areas.A、asB、whileC、
游客
2025-06-17
12
管理
问题
Safety goggles should be worn at all times______in testing areas.
选项
A、as
B、while
C、during
D、although
答案
B
解析
空格后是in testing areas这样的介词词组,这样就排除了同为介词的(C)项during。这句话意在表达“在实验区域一定要带护目镜”,因此(B)项while是正确答案。这句话的完整表达是Safety goggles should be worn at all times while you are in testing areas,此处省略了“主语+动词”(you are)。像这样由when,while,though,wherever等引导的从句省略主语和谓语动词的情况非常多。
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