badly的比较级是worse,最高级是worst,排除A.
做得糟不用poor,排除B.
John做得糟,我做得更糟,而不是也糟,排除C.
正确答案：D.still worse .
still在这里强调比较级,意思是“还要”,“更”.又如：
It's hot today,but it'll be still hotter tomorrow.
今天很热,但明天会更热.
The sick child looks still worse today than yesterday.
那个病童的情况今天看起来比昨天更不妙.