Crude oil is refined in a refinery, ______makes it possible to get many grades of oils for different uses.

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问题 Crude oil is refined in a refinery, ______makes it possible to get many grades of oils for different uses.

选项 A、as
B、that
C、this
D、which

答案D

解析 本题考查非限制性定语从句的用法。非限制性定语从句中,从句缺少主语,指物时应用which来引导。
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