2. 考研
  3. _______oil has to be refined before being put to actual use in motors and planes.

_______oil has to be refined before being put to actual use in motors and planes.

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问题 _______oil has to be refined before being put to actual use in motors and planes.
选项 A、Coarse
B、Cruel
C、Crystal
D、Crude
答案D
解析 译文为：原油必须经过提炼才能用于机动车和飞机的使用中。coarse粗糙的，粗俗的，下等的；cruel残忍的；crystal水晶；crude天然的，未加工的。crude oil意为“原油”。
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