单选题The selection of an oil depends （） on the operating conditions, the design of the engine and the type of fuel to be burned.Ato a great extentBon a great extentCon mainlyDon only
单选题
The selection of an oil depends （） on the operating conditions, the design of the engine and the type of fuel to be burned.
A
to a great extent
B
on a great extent
C
on mainly
D
on only
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