问题补充:
She was ill, she still went to work and tried her best to do the work.
A. though
B. because
C. if
D. but
答案:
A. though
B. because
C. if
(答案→)D. but
解析:though虽然,尽管;because 因为;if是否,如果;but但是,可是。句意:她病了,但是他仍旧去上班,尽最大努力来做这项工作。结合语境可知上下文是转折关系,though表示转折关系一般位于句首,故选D。