问题
单项选择题
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
参考答案：C
解析：
考查动名词的用法。本句状语从句插入到动词help之后，can't help doing sth．“情不自禁做某事”，故选C。