this is _____the river was polluted答案是how,为什么不能用that

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• 三道英语语法1This is___the term"it rains cats and dogs."has come into use答案是why为什么不能用how “如何”我觉得也通啊2Perseverance is a kind of quality,and that's___it takes yo do anything well.为什么用what3I feel a bit disappoint as the new house isn't quite___it should be为什么用what
• 1.The next morning she found the man___in bed,dead.选A对么?A.lying B.lie C.lay D.laying 2.___at the station,we found the train___.答案是A为什么不选B呢?A.Arriving,gone B.Arrived,gone C.Arriving,go D.To arrive,going3.The letter___by him hasn't been posted yet.答案是A为什么不选B呢?A.written B.was written C.is written D.writing4.The___water is not fit for drinking.答案是A为什么不选B呢A.polluted B.polluting C.polluteing D.pollute 5.He took a___stick and went into the hole.答案是A为什么不选B呢A.
• Betty goes to learn how to play the violin every afternoon ____ Saturday and Sunday .She does housework on these days .A.on B.during C.during D.except 为什么选B不选C,请详解,不好意思打错了，C是from。答案是这样翻译的，Betty每天下午都学习如何拉小提琴，除了周六日在家做家务外
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• The shocking news made me realise __terrible problems we would face 答案是WHAT 我想问为什么不能用HOW,应为我觉得HOW 一样说的通
• --This is for you.--You ____ have!I don't know how to thank you.A.mustn't B.couldn't C.needn't D.shouldn't答案是D.为什么不选择C呢?
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