( )you ( ) anywhere beforeA did surfB have surfed为什么

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( )you ( ) anywhere beforeA did surfB have surfed为什么
( )you ( ) anywhere before
A did surf
B have surfed
为什么

( )you ( ) anywhere beforeA did surfB have surfed为什么
选B [你以前上过网吗?]
注意:before(以前)单独使用,放在句末时用于现在完成时的结构:have / has done

B have surfed
用现在完成时表示对现在的影响