how time flies several years --- since we started our middle school life we will keep the pleasant experiences in our mindsa\ have passb\ has passedc\ will pass请您说明理由好吗?

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how time flies several years --- since we started our middle school life we will keep the pleasant experiences in our minds
a\ have pass
b\ has passed
c\ will pass
请您说明理由好吗?

B since 引导的从句,主句用现在完成时

since加上某一点时间（即特定的在过去一时间段里的一个时刻或一个短暂性动作）用现在完成时，只有B是过去分词，several years是一段时间，一个整体，所以用has

Several years 在这里被看成是一个【时间段】， 整体！

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