She couldn’t help even though she tried not to at the strange clothes her friend was we

问题补充：

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

答案：

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。