The runners several times their positions on the starting line, otherwise they will be kic

The runners several times their positions on the starting line, otherwise they will be kicked out.
A. are warned, making up
B. warn, to make up
C. have been warned, to take up
D. warn, to have taken up

A. are warned, making upB. warn, to make up(答案→)C. have been warned, to take upD. warn, to have taken up解析：可联系答.案.网客服索取。

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