－Jeffery seems to go without proper food and sleep for days.
－Leave him alone.That's he reacts to a lost love.
A. what
B. how
C. why
D. when
网友回答
A. what
(答案→)B. how
C. why
D. when
解析：B 考查表语从句连接词。根据句意可知，Jeffery 数日茶饭不思是他失恋的反应。react为不及物动词，“如何反应”应用how表示。