请选择DCBA)o+I7a)o,v,w/E)[3\+b He and his mother _____ going shopping.-I9F)?*Q)F1I
A. is-I9F)?*Q)F1I
B. are-I9F)?*Q)F1I
C. be-I9F)?*Q)F1I
D. am-I9F)?*Q)F1I