he became seriously ill he still went on working.A. IfB. UnlessC. AndD. Even though

问题补充：

he became seriously ill, he still went on working.

A. If

B. Unless

C. And

D. Even though

答案：

A. If

B. Unless

C. And

(答案→)D. Even though

解析：even though(=even if) 从属连词，意为：“即使，即使……也……；”引导让步状语从句。even though引出的是事实，even if引导的含有强烈的假定性。故选D：Even though he became seriously ill, he still went on working.尽管他病得很严重，但他还是继续工作。