He is really considering ______ himself to ______ these children of the poor mountain village.

A．to devote; educating

B．devoting; educating

C．devoting; educate

D．to devote; educate

临床诊断下颌下腺涎石并发下颌下腺炎的依据是（）

A.进食时下颌下腺肿胀并伴发疼痛

B.导管口溢脓

C.反复肿大，但与进食无关，下颌下腺分泌正常

D.双手触诊可扪及导管内结石

E.进行性肿大，无进食肿胀或下颌下腺炎症发作史