The computer doesn’t work well and it requires _____ but the manager requires me _____ to use it.

A．to change; to continue

B．changing; continuing

C．changing; to continue

D．to change; continuing

女性，50岁，因吞咽困难半年，加重2周且体重3个月减轻5kg来院就诊。体格检查：消瘦，贫血貌，左锁骨上扪及一约0.8cm肿大淋巴结，经X线检查明确为食管癌。试问食管癌的典型症状是（）

A.持续性胸背痛

B.声音嘶哑

C.进行性吞咽困难

D.消瘦、乏力

E.锁骨上淋巴结肿大、转移