At the head of the procession each holding a red flag in his or her hand.A. the Young Pi

问题补充：

At the head of the procession , each holding a red flag in his or her hand.

A. the Young Pioneers marched

B. marched the Young Pioneers

C. did the Young Pioneers march

D. where marched the Young Pioneers

答案：

A. the Young Pioneers marched

(答案→)B. marched the Young Pioneers

C. did the Young Pioneers march

D. where marched the Young Pioneers

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