made him unhappiest of all was he had nowhere to unburden himself.
A. What; what
B. What; that
C. That; what
D. That; because
网友回答
A. What; what
(答案→)B. What; that
C. That; what
D. That; because
解析：考查名词性从句。本题第一空是主语从句，what引导起这个主语从句且在句中做主语；第二空的that引导起表语从句，在句中不充当任何成分，只起引导和连接作用。句意：让他最不开心的是他没有地方去释放自己的压力。故B正确。