It may not rain; but you’d better take an umbrella .A. in returnB. in needC. in caseD. in

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A. in return
B. in need
(答案→)C. in case
D. in fact
解析：考查介词短语：A. in return做为回报B. in need 需要C. in case以防万一D. in fact事实上，句意：可能不会下雨，但最好带雨伞以防万一。选C。