问题补充：
Our father often told us in the past that is believing.
A. to see
B. seeing
C. see
D. to be seen
答案：
A. to see
(答案→)B. seeing
C. see
D. to be seen
解析：当表语是非谓语动词时，主语应与之保持平行。在此句等于：To see is to believe.
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