Asoilpipelineconnectionswerebroken_____quantityof

As oil pipe line connections were broken, _____ quantity of oil was caused to spill onto the wharf and into the dock water.

A.a not knowing

B.an unknowing

C.an unknown

D.a not know

正确答案：C
一个油管线的链接一旦损坏不明数量的油漏到码头的水里