问题
选择题
—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
答案：A
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—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：A