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Whatwastheoriginoftheoilnowdrivesourmotor-carsandaircraft?A.whatB.whereC.inwhichD.which为什么选D

题目详情
What was the origin of the oil ___ now drives our motor-cars and aircraft?
A.what B.where C.in which D.which 为什么选D
▼优质解答
答案和解析
这是个定语从句啊,用which或者that引导后边的定语,修饰oil.