Thetheory focuses on the __________ (exist) of life on other planets. （所给词的适当形式填-组卷网

语法填空-单句语填较易0.85 引用1 组卷40

The theory focuses on the __________ (exist) of life on other planets. （所给词的适当形式填空）

23-24高一上·黑龙江·期末

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Before that, we had never been in contact with or studies this virus, nor did we know of its __________. (exist) (所给词的适当形式填空)

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