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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howtimefliesseveralyears---sincewestartedourmiddleschoollifewewillkeepthepleasantexperiencesinourmin

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?
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?

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?
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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