The old man got into the of storing money under the bed.A. traditionB. habitC. useD. cust

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A. tradition
(答案→)B. habit
C. use
D. custom
解析：　get into the habit of doing sth.意为“养成了做......的习惯。habit指个人的习惯,而custom则指社会的风俗习惯。tradition“传统。