The historical and cultural background to the play has been very carefully and thoroughly ___.
The historical and cultural background to the play has been very carefully and thoroughly ___.
A、searched
B、researched
C、sourced
D、reserved
【正确答案】：B
【题目解析】：search 搜寻；research 研究调查；source 源头 ； reserve 储备
原意：对该剧的历史文化背景进行了非常细致而深入的_____B符合题意，深入的研究
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