单选题It is necessary for us （） after having served for a certain period.Ato change the lube oilBhave the lube oil purifiedChave the lube oil burntDto analyze the lube oil
单选题
It is necessary for us （） after having served for a certain period.
A
to change the lube oil
B
have the lube oil purified
C
have the lube oil burnt
D
to analyze the lube oil
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