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。