Seven presidents have been seen__during the past 20 years

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Seven presidents have been seen__during the past 20 years
A.to come and go
B.coming and going
C.come and go
D.to come and to go
why choose

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 What have I been doing for the past 20 years that’s been so You have been M.I.A for the past seven sorority newsletters, For the past two years,I have been busy preparing for the ex ____ so many profits have been made in the past three years in the past few years there have been great changes in my ci their living conditions have been i___ in the past few years In the past twenty years,many tall buildings have been built 求翻译!For the past ten years,I have been frustrating my parent Many new railways have been laid down in the past few years. In the past ten years many football clubs(had)(have)been run 英语翻译Dear Sirs,For the past 8 years I have been a statisticia