Ling Ling is tired, she wants to have a rest.
A. Because, so
B. Why, because
C. /, so
D. So, because
网友回答
A. Because, so
B. Why, because
(答案→)C. /, so
D. So, because
解析：在英语中如果表示因果关系，如果用了because，就不能用so；用了so，就不能用because，另外why作为特殊疑问词，很明显放在本句中是错误的。所以本题选C。