Linguistic research often requires a period of fieldwork where the linguist can study and record the spoken dialects of a region

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问题 Linguistic research often requires a period of fieldwork where the linguist can study and record the spoken dialects of a region.

选项 A、through which
B、during which
C、with which
D、by which

答案B

解析 由题干可知,先行词是period,表示时间,因此引导词可以采用“介词+关系代词”的形式或when,B项during which符合要求。
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