当你询问对方什么时候写作业时说：请选择ABC-v.I(D;Q;V1Y2r-j;P4v:o5Q9M7P4s9b+d7d:V5x'?-j6b3K9y9Q
A. What are you doing ?:V5x'?-j6b3K9y9Q
B. When do you do homework ?:V5x'?-j6b3K9y9Q
C. Who are you ?:V5x'?-j6b3K9y9Q