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。