问题描述：
My sister joined the dancing clud three weeks ago.（同义句）
My sister ____ ____ _____the dancing clud____three weeks.
My sister ____ ____ ___ ____of the dancing clud ____three weeks.
My sister ____ ____ _____the dancing clud____three weeks.
My sister ____ ____ ___ ____of the dancing clud ____three weeks.
问题解答：
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