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动词适当形式填空一题we are student's of NO.1 Middle school,last Sunday

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动词适当形式填空一题
we are student's of NO.1 Middle school,last Sunday we ____ (vist) a factory.the factory is close to a lake which _____(give ) us drinking waker.but we found that the factory was pouring waste directly into the lake,some farmers living near the lake report that some of their sheep and cows ____ (die ) since they drank the water from the lake .so we wrote you thid letter ____( see)if you can do something about this.We think the pollution must _____ (stop ) right now.THank you
怎么填了?请说明每空的理由,
试着解答了一下,希望对你有用:
we are student's of NO.1 Middle school,last Sunday we ____ (vist) a factory.
visited 根据过去的时间状语last Sunday,判断是过去的时态
the factory is close to a lake which _____(give ) us drinking waker.
gives “供给我们饮用水”的河,是一种常态,用现在时
but we found that the factory was pouring waste directly into the lake,some farmers living near the lake report that some of their sheep and cows ____ (die ) since they drank the water from the lake .
died 强调“喝了湖中脏水”对“现在牛羊”的现实影响,适宜用“完成时”
so we wrote you thid letter ____( see)if you can do something about this.
to see 这里动词不定式表示“目的”
BTW "thid"改称"third"
We think the pollution must _____ (stop ) right now.THank you
be stopped “污染”应“被阻止”,故括号中应该用被动语态