The Space Shuttle Columbia broke into pieces over Texas as it returned to the earth on February 1，2003，__________all seven astronauts aboard.
| A．having killed | B．killing |
| C．being killed | D．killed |
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The Space Shuttle Columbia broke into pieces over Texas as it returned to the earth on February 1，2003，__________all seven astronauts aboard.
| A．having killed | B．killing |
| C．being killed | D．killed |
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