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Investigation by the special commission revealed that ______.
A．top-level NASA officials made an arbitrary decision for takeoff
B．designers of the spacecraft failed to assess the problem with the booster
C．cold weather caused the O ring to come off the rocket booster
D．the tragedy was caused by at least three factors working together
答案
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The investigation group tried in ______to discover what caused the failure of the engine.
A．diligence
B．vain
C．vigor
D．zeal
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A.investigation
B.competition
C.research
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A. inference
B. conclusion
C. summary
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A.looking into
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The latest development of the murder investigation has just been ______ to the media.
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B．relieved
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D．retained
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An investigation was made into the accident,______(在此事故中50人丧生).
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第10题
An exhaustive（A级）investigation of the facts proves the contrary．
A．exhausted
B．tired
C．thorough
D．careful
