请选择CBA,l4t3V/|:U(F,[ -What ________ I doing? Guess!,L5]1])x+W*f)S3m,z,N1G.B
-You ________ playing the guitar.,L5]1])x+W*f)S3m,z,N1G.B
A. am; /,L5]1])x+W*f)S3m,z,N1G.B
B. /; are,L5]1])x+W*f)S3m,z,N1G.B
C. am; are,L5]1])x+W*f)S3m,z,N1G.B