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21. _______, athletes from all over the world compete the Olympic Games______ the honor of winning.
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C. Every fourth years, against; in D. Every four years, for; for
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21. _______, athletes from all over the world compete the Olympic Games______ the honor of winning.
A. Every fourth year, in; for B. Every four year, in; for
C. Every fourth years, against; in D. Every four years, for; for

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