问题
选择题
---Do you know the danger caused by smoking?
---Yes, too many cigarettes can lead to_______ lung cancer.
A．a person suffers from
B．a person to suffer from
C．a person being suffered from
D．a person suffering from
答案
答案：D
考查非谓语动词。lead to导致，to为介词，故后接-ving，根据句意为主动关系，故选D。
冠大部分破坏，龋洞很深，叩阳性，松动Ⅱ度。颊侧牙龈有一0.5mmX1mm脓肿，舌侧牙龈红肿，有波动感，探有脓溢出。X线示根吸收1/3，根分歧及近中根有大量低密度影。近中牙尖萌出