请选择CBA1a*q'{;c3F:~5O/\;k Please be quiet! Dad ______ working in the room.2I8w)B8\*a4_4I3A6]-n4A
A. am2I8w)B8\*a4_4I3A6]-n4A
B. is2I8w)B8\*a4_4I3A6]-n4A
C. are2I8w)B8\*a4_4I3A6]-n4A