_____ warned of the danger of losing his way in the jungle, he still wanted to have an adventure.   [ ]

A. To be

B. Being

C. Having been

D. Having

不宜采用塑化疗法的是

A．根尖孔尚未闭合的年轻恒牙

B．乳牙

C．根管闭锁的前牙

D．A+B

E．A+B+C