--Idroppedinonyouataboutfour,p.m.,butyoudidn'tanswerthedoor.--Oh,thatwasprobablyIwasplayingbadmintoninthestadiumnearby.()A.thatB.whatC.whenD.why
--I dropped in on you at about four,p.m.,but you didn't answer the door.
--Oh,that was probably _________ I was playing badminton in the stadium nearby.( )
A. that
B. what
C. when
D. why
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