She was afraid the dog in case it became dangerous.
A. of exciting
B. to excite
C. that she excited
D. to be exciting
网友回答
A. of exciting
(答案→)B. to excite
C. that she excited
D. to be exciting
解析：
be afraid后面既可以跟不定式be afraid to do sth．，又可以跟动名词be afraid of doing
sth．，但前者的意思是：害怕／不敢做某事；后者的意思为：对可能出现的结果的发愁或忧虑。