中国石油大学 / 中石油
正确率:100%
8. Crude oil, or unprocessed petroleum, is called sour when it contains a lot of sulfur, an impurity
A、konwing for
B、knowing as
C、known for
D、known as
A、konwing for
B、knowing as
C、known for
D、known as
参考答案:
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