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

分类: 作业答案 • 2022-07-15 09:48:39

问题描述：

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

答

选Asee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”hav...