As I will be away for at least a year, I’d appreciate from you now and then so that I can know how everyone is getting along.
A. having heard
B. to hear
C. hearing
D. being heard
网友回答
A. having heard
B. to hear
(答案→)C. hearing
D. being heard
解析：appreciate后常接-ing形式（短语）作宾语。