who has a soccer ball?中为什么要用has啊?

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• 第一问：Then man【tried out】 several 【means】 to have those people get across what he said.请问这里的tried out和means分别是什么意思?=第二问：It's obvious that her refusing to see a doctor has ____(led in/resulted in) her illness woresening.请问led in没有导致,造成的意思吗?为什么答案是result in?=第三问：It's nice to see millions who had nothing but 【a record of】 misery and hungry _____（have/to have) the chance to improve their life and livig conditions.①请解释黑框中的a record of应该怎么理解.②请问为何横线处只能用have?我脑子
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• He has a soccer ball怎么边复数句啊!
• I don't have a soccer ball,but my brother Alan does.为什么用does不用has、、、求解
• 我见过一些在decision后面有后置定语,可前面的冠词还用a的情况.比如：a decision unfavorable to the opposition.He has made a decision that he will be an inventor some time.照理说,定语表示特指,前面应该用定冠词the,可这里用的是a,是因为make a decision是固定用法吗?如果make the decision 可以的话，a decision unfavorable to the opposition中为什么要用a？
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