The little girl felt upset her pet dog died. A. whyB. because ofC. becauseD. what

问题补充：

The little girl felt upset her pet dog died.

A. why

B. because of

C. because

D. what

答案：

A. why

B. because of

(答案→)C. because

D. what

解析：此题重点考查because和because of的区别，两者都表示因为，表示原因。但前者引导句子，后者引导短语或单词。根据语境可知选择B，因为her pet dog died是句子而不是短语。