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你感冒了能不能用you have had a bad cold

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你感冒了能不能用you have had a bad cold
在一部电影中,医生给病人看完病后对病人说:you have a bad cold.
医生为什么用的不是you have had a bad cold?
you have had a bad cold与you have a bad cold.有什么区别吗
你感冒了能不能用you have had a bad cold
一个是一般现在时,一个是现在完成时.但意思差不多