I’ll keep his address I need it. A. so thatB. in order thatC. in caseD. when

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A. so that
B. in order that
(答案→)C. in case
D. when
解析：考查短语。so that 以便，所以；in order that为了，以便；in case万一，假使；when 既然。句意：我要留着他的地址，万一我需要它呢。故选C。