Fuel oil is thought to be one of the main factors （） the operation and maintenance of an engine.<br>A:have nothing to do with<br>B:having nothing to do with<br>C:have much to do with<br>D:having much to do with

Fuel oil is thought to be one of the main factors （） the operation and maintenance of an engine.
A:have nothing to do with
B:having nothing to do with
C:have much to do with
D:having much to do with

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