请选择CBA9A.z)U.D*I-~7L,?2MYesterday my parents and I ________ our house.6y8j2n0v1\/b;P;s*Z8n;x
A. are cleaning6y8j2n0v1\/b;P;s*Z8n;x
B. cleaned6y8j2n0v1\/b;P;s*Z8n;x
C. are going to clean6y8j2n0v1\/b;P;s*Z8n;x