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答案: were; is (be) a lot of rubbish on the floor so I asked Mary to sweep it up. 解析: there be句型中 be動(dòng)詞的單復(fù)數(shù)取決于其后的主語(yǔ), a lot of rubbish(不可數(shù)名詞 ),因此后面謂語(yǔ)動(dòng)詞要用單數(shù)。 答案: was million tons of coal (be) exploited every year in the city. 解析: 主語(yǔ)為 coal,是不可數(shù)名詞。根據(jù)題意,此處要用被動(dòng)語(yǔ)態(tài)。 答案: is of the Long M