start he since的区别

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• 45.3 英语选择补充短文空白处的题目（need,animal,I,put,make,expect,find,end,look,since,little,enough）\x05A good friend of ___1___ lives with six hundred animals on an island.Ever ___2___ he left school,he has travelled all over the world ___3___ for animals for his own zoo.He writes bookd about his travels,and about his wonderful ___4___.The money for his books helps him to play for all the animal food.My friend told me that when he was looking for water las week (The
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• 什么时候用have什么时候用 has?has用于第三人称单数（如：he、she、it……）have用于第三人称复数（如:we、they……）和第一人称（如：I、you……）——————————————————————————————————除此之外还有什么规则?还有、当主语是some flowers之类的some+名词的时候使用has还是have希望再给我讲讲are和is的区别
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