I couldn't believe what I -------(see).

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Icouldn''tbelievewhatI-------(see).Icouldn''tbelievewhatI-------(see).Icouldn''tbelievewhatI-------(see

I couldn't believe what I -------(see).
I couldn't believe what I -------(see).

I couldn't believe what I -------(see).
Saw

saw

saw,前面已经用的是过去式，后面理所当然也要用过去式