As time ( )by ,there're more and more kinds of stamps.这里go应该用过去式还是一般现在时

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Astime()by,there''remoreandmorekindsofstamps.这里go应该用过去式还是一般现在时Astime()by,there''remoreandmorekindsofst

As time ( )by ,there're more and more kinds of stamps.这里go应该用过去式还是一般现在时
As time ( )by ,there're more and more kinds of stamps.这里go应该用过去式还是一般现在时

As time ( )by ,there're more and more kinds of stamps.这里go应该用过去式还是一般现在时
叙述一般情况的 一般现在时goes