单选题The selection of an oil from the （） depends to a great extent on the operating conditions, the design of the engine and the type of fuel to be burned.Acommercially availableBcommerciallyCcommercial availableDcommerce available
单选题
The selection of an oil from the （） depends to a great extent on the operating conditions, the design of the engine and the type of fuel to be burned.
A
commercially available
B
commercially
C
commercial available
D
commerce available
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