It’s a good habit to keep everything in your study.A. in the wayB. in placeC. in handD.

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A. in the way
(答案→)B. in place
C. in hand
D. in case
解析：考查短语。A. 妨碍，挡道  B.适当的，在适当位置C. 在手头D. 万一，假使。句意：在学习中保持一切有秩序是个好习惯。故选B。