选A
see后面可以跟不定式和ING的,跟ING的时候是刚好看到那个片段,一个瞬间．
不定式是因为从后面的”过去二十年”我们可以看出这个see应该是看到了全过程的,而普通情况下只用原形就可以了,但是本句的前面用了被动”have been”,所以要还原to,写出完整的不定式．
同理还有make sb （to） do sth,平常可以写"She make me cry"省略to,但是有被动的话就要还原省略的to,如”I was made to cry by her"
Seven presidents have been seen__during the past 20 years
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