No one kows exactly_____(Is there life on other planets?)将括号内的句子改称从句

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No one kows exactly_____(Is there life on other planets?)将括号内的句子改称从句
x)WKU//VHHL.ɩ bԢT̴T|W '1/^醶gko|VONx6ermii~ _ 1*iz`O[W=ٱYX3ayv n

No one kows exactly_____(Is there life on other planets?)将括号内的句子改称从句
No one kows exactly_____(Is there life on other planets?)将括号内的句子改称从句

No one kows exactly_____(Is there life on other planets?)将括号内的句子改称从句
whether there is life on other planets.
全句为:No one kows exactly whether there is life on other planets.