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Scientists think that there has been life for__31_ of years. However we haven’t found life on other...

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broken through    worked out      fallen out    got round  
aren’t; are    aren’t; were    weren’t; are    weren’t; were  
HA=BA<CA(CA:时间年龄,BA:骨龄,HA:身高年龄)  HA<BA=CA  BA<HA<CA  BA>HA>CA  HA=BA=CA  
HA=BA<CA(CA:时间年龄BA:骨龄HA:身高年龄)  HA<BA=CA  BA<HA<CA  BA>HA>CA  HA=BA=CA  
HA=BA<CA(CA:时间年龄,BA:骨龄,HA:身高年龄)  HA<BA=CA  BA<HA<CA  BA>HA>CA  HA=BA=CA  
when losing leaves    leaves are lost    that losing leaves    the leaves lost  
broken through    worked out    fallen out    got round  
aren’t; are    aren’t; were    weren’t; were    weren’t; were  
aren’t; are    aren’t; were    weren’t; are    weren’t; were  
HA  hA  HA  hA  
when    after    since    before  
broken through    worked out    fallen out    got round  
when    after    since    before  
HA=BA<CA(CA:时间年龄BA:骨龄HA:身高年龄)  HA<BA=CA  BA<HA<CA  BA>HA>CA  HA=BA=CA  
aren't; are    aren't; were    weren't; are    weren't; were  
aren't; are    aren't; were    weren't; are    weren't; were  
has had    have had    has been    have been  
has had    have had    has been    have been  

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