问题
选择题
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
答案
答案：C
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。