Engine room fires have been started by neglected oil leaks dripping on to hot pipes or exhaust manifolds （） insulation has not been replaced after maintenance.<br>A:which<br>B:when<br>C:whose<br>D:what

Engine room fires have been started by neglected oil leaks dripping on to hot pipes or exhaust manifolds （） insulation has not been replaced after maintenance.
A:which
B:when
C:whose
D:what

出自：海船船员证

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