请选择DCBA9O-?6b6S6S'?9P5F:]9v-G;{7j3b:EThe doctor often tells him ____ more exercise.-B-O0U8M-T0|
A. to take-B-O0U8M-T0|
B. taking-B-O0U8M-T0|
C. taken-B-O0U8M-T0|
D. take-B-O0U8M-T0|