问题
单项选择题
Oil is an important（）material which can be processed into many different products, including plastics.
A.uncovered
B.raw
C.fresh
D.crude
答案
参考答案：B
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Oil is an important（）material which can be processed into many different products, including plastics.
A.uncovered
B.raw
C.fresh
D.crude
参考答案：B