i found ----important to speak English as much as possible答案是it,但为什么不是it is

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i found ----important to speak English as much as possible答案是it,但为什么不是it is
i found ----important to speak English as much as possible
答案是it,但为什么不是it is

i found ----important to speak English as much as possible答案是it,但为什么不是it is
it is 在时态上和过去式found 不一致,如果改为it was 就可以

正确答案应该是 it
还可以是 it was ,因为主句的主语found 是过去式,所以不能用 it is

it 在这里是形式宾语,真正的宾语是后面的不定式。
因为这个不定式很长,包括了从 to 到句末的所有的词,所以把它放在后面,而用 it 来代替它,放在应该出现的位置。