문제가 Robert Wales, one of the Breeman Historical Society's founding members, ___ several campaigns to preserve the city's cultural heritage landmarks.
a)have planned b)was planned c)has been planning d)to plan 답이 c인데 왜 b가 아닌 c죠?
문제가 Robert Wales, one of the Breeman Historical Society's founding members, ___ several campaigns to preserve the city's cultural heritage landmarks.
a)have planned b)was planned c)has been planning d)to plan 답이 c인데 왜 b가 아닌 c죠?


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