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According to the leading theory ---- the Moon formed, a Mars-sized body struck Earth some 4.5 billion years ago, generating a disk of debris that coalesced into the Moon.A) of whichB) by whatC) in whereD) of howE) by when
According to the leading theory ---- the Moon formed, a Mars-sized body struck Earth some 4.5 billion years ago, generating a disk of debris that coalesced into the Moon.
A) of which
B) by what
C) in where
D) of how
E) by when
