made things worse, he said, was that his roommate never took part in any of the cleaning work．
A. What
B. Which
C. That
D. Who
网友回答
(答案→)A. What
B. Which
C. That
D. Who
解析：考察主语从句。What引导起主语从句what made things worse并在句中作主语，结合句意可知A正确。句意：他说：让事情更糟糕的是他的室友从来不参加清洁工作。