There is ___ "u",___ "s" and ___ "e" in use.(a/an)出错题了! 应该是这道题 There is ( ) “P",( )“E”and ( )"N" in pen.(a/an)

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There is ___ "u",___ "s" and ___ "e" in use.(a/an)
出错题了!
应该是这道题

There is ( ) “P",( )“E”and ( )"N" in pen.(a/an)

a an an