---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 题目和参考答案——青夏教育精英家教网—

题目内容

---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

how come在这里的意思是“怎么回事？”，表示不解，惊讶。

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