问题描述：
[单选]
Impurities in the fuel oil will affect the operation of the engine， which has（）the use of separator and some other devices．
A．brought about
B．caused for
C．resulted from
D．led
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答案解析：无
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上一篇：The emulsion of the oil is mainly caused by（）．
下一篇：The lube oil to lubricate the surfaces of the cylinder liners is spread over by the（）．
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