The spacewalk performed by Chinese astronaut Zhai Zhigang on Saturday afternoon a major breakthrough in China's space program
A. predicted
B. told
C. marked
D. signed
网友回答
A. predicted
B. told
(答案→)C. marked
D. signed
解析：本句句意：中国宇航员翟志刚在星期六下午的太空行走标志着中国航空事业的重大突破。mark标志，成为……的征兆，predict预言，tell告诉，sign签名，示意。