下列属于地表水质量评价方法中一般型水环境指数的是( )
A. 北京西郊水质量指数
B. 南京水域质量综合指标
C. 有机污染综合评价指数
D. 布朗水质指数
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()you ( ) the room? (clean)Yes, we ( ) that already. (do)When ( ) you ( ) it?(do)We ( ) it an hour ago. (do)
( ) he ( ) this film yet? (see)Yes.When ( ) you ( ) it?(see)We ( ) it an hour ago. (see)
How many times ( ) you ( ) there? (be)
I ( ) the novel twice. It's interesting. (read)