填空题 (A) heat exchanger is a device (in) which (heat taken) from a hot liquid or gas in order to warm a (cold place). A. A B. in C. heat taken D. cold place
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【正确答案】 1、C    
【答案解析】在该句中which引导的定语从句无谓语。根据句意“热量可从热的液体或气体中得到”，故应将C项中的heat taken改为heat is taken。