19. Runners run and jump their way through obstacles while racing against their _____.
(A)owners
(B) proponents
(C) allies
(D) opponents

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統計： A(8), B(13), C(11), D(74), E(0) #1784596

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跑者在與對手比賽時,用他們奔跑和跳躍的方...
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