题目

Only when _______ possible to settle the problem. A. does the editor come will it be               B. the editor comes will it be C. has the editor come it will be                D. the editor comes it will be   答案：B15．青春期发育最显著的特点是（　　）A．性器官发育成熟B．身高突增C．神经系统的调节功能增强D．心肺功能提高