问题补充：
The reason Beethoven went away to the country is .
A. that he was gradually going deaf
B. because he was gradually going deaf
C. on account of the fact that he was gradually going deaf
D. since he was gradually going deaf
答案：
(答案→)A. that he was gradually going deaf
B. because he was gradually going deaf
C. on account of the fact that he was gradually going deaf
D. since he was gradually going deaf
解析：语法结构题。本句的难点是：如果主语是reason，那么后面作表语的从句应由that引导。本句的意思是：贝多芬去乡下的原因是他的耳朵正在逐渐变聋。
