If there(be)__________ no oxygen on earth,life as we know it(exist,not)________填空题!

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If there(be)__________ no oxygen on earth,life as we know it(exist,not)________填空题!
If there(be)__________ no oxygen on earth,life as we know it(exist,not)________
填空题!

If there(be)__________ no oxygen on earth,life as we know it(exist,not)________填空题!
were
wouldn't exist
虚拟语气的考察.
就填 我这个.
地球上肯定 有氧气,
没有氧气肯定 是虚拟.
绝对是对的!

is + will not exist

If there is no oxygen on earth, life as we know it would not have existed

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