CLOISTER (The monk was always in the cloister )
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MONASTERY
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ROOM OF WORSHIP
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TEMPLE
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STUDY ROOM
A
Correct answer
Explanation
A cloister refers to a monastery or convent, or the covered walkways within such religious buildings. In this context, "the monk was always in the cloister" means he was always within the monastery grounds. Temple is too broad, and room of worship/study room are too specific.