She couldn’t help, even though she tried not to, at the strange clothes her friend was wearing.
A. to laugh
B. laugh
C. laughing
D. laughed
网友回答
A. to laugh
B. laugh
(答案→)C. laughing
D. laughed
解析：这句首先要知道：even though she tried not to是插入语，考查的是can’t help doing情不自禁地做…,句意是：即使她想忍住，还是情不自禁的嘲笑朋友穿的奇怪的衣服。选C。