题目内容
15．My pen pal said he would write to me，but I _____ any letters from him so far．（ ）| A． | won't receive | B． | haven't received | ||
| C． | hadn't received | D． | didn't receive |
分析 我的笔友说要给我写信，但我至今都没收到过他的来信．
解答 答案：B 联系语境再根据关键词so far（至今为止），可知这是现在完成时态的标志词，要使用现在完成时have/has+过去分词；再根据语境及but转折可知并没有收到来信，所以此句应为否定形式，又知现在完成时的否定句直接在have后面加not，所以此处应填haven't received．故选B．
点评 此题考查动词现在完成时的使用，动词填空时，要先抓住标志词判断时态，现在完成时的标志词常有already，ever，yet，so far，for，since等等，要熟记用法．也要掌握have是现在完成时态的助动词，变否定直接加not，变一般疑问句直接提前have．
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要求：1．词数不少于90，文章的开头已为你写好，不计人总词数；
2．要点完整、层次清晰、语法正确、上下文连贯；
3．文中不得使用真实的人名、校名．
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Now we know that some of the rivers are polluted in our country and that we are short of water although there are some rivers and lakes in our city．As a result，we need to protect and save water．For example，we shouldn't leave water running after using it．Besides，we mustn't throw rubbish into the rivers．
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| 活动内容 | 邀请王老师作报告；全班讨论如何节水和爱护水． |
| 活动收获 | 我们知道我国一些地方水源受到污染；我市虽有一些河流和湖泊，但也缺水．所以…（节水和爱护水的方法至少各发挥一点）． |
| 活动感受 | … |
2．要点完整、层次清晰、语法正确、上下文连贯；
3．文中不得使用真实的人名、校名．
Last Monday we held an activityabout saving and protecting water．
Mr Wang was invited to give us a talk．After his speech，we had a discussion about how to save and protect water．
Now we know that some of the rivers are polluted in our country and that we are short of water although there are some rivers and lakes in our city．As a result，we need to protect and save water．For example，we shouldn't leave water running after using it．Besides，we mustn't throw rubbish into the rivers．
After taking part in the activity，we had a better understanding of the importance of protecting the environment and saving water．．
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