Mary ( ) terrible headaches;that's why she didn't come.答案是suffered from,我想不通,我觉得应该填 was suffering from,这样对吗?如果不对又为什么呢?为什么填suffered from呢?

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没必要强调它是过去正在发生的,只说明这一事实就可以了.suffer常与from连用,表"忍受..."