请选择DCBA'i-s1T)p0T6x9H2L5j,n)O Not only Tom but also Alice and Mary _________ busy.:r2S0C.v4I
A.is:r2S0C.v4I
B.was:r2S0C.v4I
C.are:r2S0C.v4I
D.has:r2S0C.v4I