单选题 She had said little so far, responding only briefly when ______.
A. speaking B. spoken to C. spoken D. speaking to

【正确答案】 B
【答案解析】[解析] 过去分词作时间状语，有被动之意。全句意为：她一直很少说话，只是当有人与她讲话时才做简短回答。