题干
He's unlucky,and he's always suffering____________ luck one after another.
A：a sick
B：an ill
C：sick
D：ill
答案(点此获取答案解析）
D
A：a sick
B：an ill
C：sick
D：ill
腐蚀中，发生还原反应的那个电极上进行的电极反应是
