copies of Mo Yan's works will be on sale after his talk at the Press Conference.
A. Signing
B. Sign
C. Signed
D. To sign
网友回答
A. Signing
B. Sign
(答案→)C. Signed
D. To sign
解析：答案：C 考查非谓语动词。句意为：莫言在新闻发布会上讲完话后，有他签名的作品将会被出售。sign与copies之间构成被动关系，因此用过去分词作定语。故C项正确。