请选择DCBA9w0]2^'v-b0W -Where is your sister?'G3_,u+p7|8A*g/v4Q0H+o
-She _________ my mom with cooking.'G3_,u+p7|8A*g/v4Q0H+o
A. helps'G3_,u+p7|8A*g/v4Q0H+o
B. helping'G3_,u+p7|8A*g/v4Q0H+o
C. is help'G3_,u+p7|8A*g/v4Q0H+o
D. is helping'G3_,u+p7|8A*g/v4Q0H+o