请选择DCBA3S0Q.d6p2?9g)~:N8g The doctor often tells him _______ more exercise．+X(a6q5M/C'd1R
A．to take+X(a6q5M/C'd1R
B．taking+X(a6q5M/C'd1R
C．taken+X(a6q5M/C'd1R
D．take+X(a6q5M/C'd1R