She was ill she still went to work and tried her best to do the work.A. thoughB. becauseC

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。