Do you know how long our earth _____?

A. came into existence
B. came in existence
C. was in existence
D. has been in existence
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科目：高中英語 來源：0110 同步題 題型：單選題

Do you know how long our earth _____?
[     ]
A. came into existence
B. came in existence
C. was in existence
D. has been in existence

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