It is necessary for us （） after having served for a certain period.<br>A:to change the lube oil<br>B:have the lube oil purified<br>C:have the lube oil burnt<br>D:to analyze the lube oil

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

出自：海船船员证

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