A.Jack vacuumed the living room but not the bathroom. B.Jack cleaned the bathroom but not the living room. C.Jack cleaned neither the living room nor the bathroom because he is exhausted. D.Jack cleaned both the living room and the bathroom.
【简答题】Scientists were warning the world about global warming 60 years ago. If people had acted quickly back then, they ........................................(stop) today’s disasters. But they did nothing.