Thousands of athletes _______ in many countries competed ______ medals in the 2008 Olympic Games in Beijing.
| A．involved, in | B．involving, by | C．involving, against | D．involved, for |
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Thousands of athletes _______ in many countries competed ______ medals in the 2008 Olympic Games in Beijing.
| A．involved, in | B．involving, by | C．involving, against | D．involved, for |
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