-Look，Theguardofhonor（仪仗队）ofthePLAaretakingpartintheparadeonRedSquare．-________excitingevent!（）A.HowaB.WhatanC.HowanD.Whata

　　-Look，The guard of honor（仪仗队） of the PLA are taking part in the parade on Red Square．

　　-________ exciting event!（）

　　A.How a

　　B.What an

　　C.How an

　　D.What a