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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
考查交際用語(yǔ)。A怎么會(huì)？為什么會(huì)這樣？C為了什么？D為什么不？句意：—發(fā)現(xiàn)號(hào)在發(fā)射過(guò)程中失敗了�！趺磿�(huì)？他們一直在準(zhǔn)備測(cè)試。
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