问题补充：
There were dirty marks on her trousers she had wiped her hands.
A. when
B. which
C. where
D. That
答案：
A. when
B. which
C. where
(答案→)D. That
解析：句意为：她的裤子上有一些很脏的斑迹，这些斑迹就是他揩手时留下的。
此为同位语从句，同位语从句就是用于对前面名词的进一步解释，说明名词的具体内容，同位语从句一般由that引导，据此：选D
考点:考察同位语从句引导词的用法
