7.Some measures ------ to protect wildlife resources.A.are t

7.Some measures ______ to protect wildlife resources.A.are taking B.are taken C.are being taken7.Some measures ______ to protect wildlife resources.A.are taking B.are taken C.are being taken D.being taken 此题为什么不选B,解释说句子的意思是“正在采取一些措施去保护野生资源”.为什么不能说一些措施被采取了去保护野生资源?