问题补充：
His letter was especially welcome as I from him for long.
A. haven’t heard
B. would not heard
C. hadn’t heard
D. didn’t heard
答案：
A. haven’t heard
B. would not heard
(答案→)C. hadn’t heard
D. didn’t heard
解析：考查语境中的时态综合运用。从内容上看应为完成时，从所给信息看，应为过去时，这样就容易作出正确选择：过去完成时。
