请选择CBA7A6c(W;D3r._;?.c How_______Mike and Helen spend_______weekends?*s'I*T9b*Z1j(_4R1?4]:y'^
A. does, their*s'I*T9b*Z1j(_4R1?4]:y'^
B. do, his*s'I*T9b*Z1j(_4R1?4]:y'^
C. do, their*s'I*T9b*Z1j(_4R1?4]:y'^