这里的had是过去式，这个句子是一般过去时，过去完成时的结构是had+动词过去分词。过去完成时表示过去已经完成并对现在产生影响。一般现在时（have）表示真理，习惯，事实等。一般过去时描述过去，叙述事情，最常用
英语语法：“ I had to throw away the food after I left the fridge
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