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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Thereis___"u",___"s"and___"e"inuse.(a/an)出错题了!应该是这道题Thereis()“P",()“E”and()"N"inpen.(a/an)Thereis___

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)
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)

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