where is the policeman He is s( ) the taffic on the road.

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where is the policeman He is s( ) the taffic on the road.

supervise:
vt.监督,管理;指导
vi.监督,管理;指导
superintend
vt.监督;管理;主管;指挥
vi.监督;主管;指挥
故答案:supervising/superintending

监督 supervise

solving