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---Spacecraft "Discovery" has failed in the course of launch.

---_____? They have been preparing for the test.


  1. A.
    How come?
  2. B.
    When
  3. C.
    What for
  4. D.
    Why not
A
考查交际用语。A怎么会?为什么会这样?C为了什么?D为什么不?句意:—发现号在发射过程中失败了。—怎么会?他们一直在准备测试。
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