填空题 One sign {{U}}by which{{/U}} you are making progress in {{U}}an art{{/U}} such as painting or photography is {{U}}that{{/U}} you begin to realize how much {{U}}there is{{/U}} to learn. A. by which B. an art C. that D. there is
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【正确答案】 1、A，改为that    
【答案解析】[试题分析] 本题考查从句引导词的运用。 [详细解答] 本题中的sign意为“迹象”，它后面的从句you are making progress是它的同位语，而不是它的定语，同位语从句只能用that来引导，故应将by which改为that。