31．With the cell phone available I can do whatever I want to do and stillin touch with my

问题补充：

31．With the cell phone available, I can do whatever I want to do and stillin touch with my parents and friends．

A. stay

B. to stay

C. staying

D. Stayed

答案：

(答案→)A. stay

B. to stay

C. staying

D. Stayed

解析：D