◎ 题干
—Spacecraft "Discovery" has failed in the course of launch.
—_____? They have been preparing for the test.
[     ]
A. How come  
B. When
C. How  
D. Why not
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“—Spacecraft "Discovery" has failed in the course of launch.—_____? They have been preparing for the test.[ ]A. How comeB. WhenC. HowD. Why not…”主要考查了你对  【日常用语、谚语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。