I don’t think it easy even if we work hard the South Korea and the North Korea to sit d

问题补充：

I don’t think it easy, even if we work hard, the South Korea and the North Korea to sit down to talk at present.

A. persuaded

B. to persuade

C. persuade

D. persuading

答案：

A. persuaded

(答案→)B. to persuade

C. persuade

D. persuading

解析：B两个逗号之间的内容(even if we work hard)是插入语，不影响句意。it是形式宾语，真正的宾语是动词不定式。“我认为，即使我们付出很大努力，现在也很难使朝韩双方坐下来和谈。”故选B。