It quite correct that happiness es from thinking about things in a positive way.
A. has turned out
B. has been turned out
C. is turning out
D. is turned out
网友回答
A. has turned out
B. has been turned out
C. is turning out
D. is turned out
解析：考查短语辨析动词。turn out这里作连系动词用，是不及物动词，故不用进行时态，也不能用被动语态。