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句子诊断knowledgeisatreasure,butpracticethekeytoit.这句话有错吗?

题目详情
句子诊断
knowledge is a treasure,but practice the key to it.这句话有错吗?
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答案和解析
treasure 为不可数名词,其前面的冠词 a 要删去.but practice the key to it.这句话中无动词,应在practice和 the 中间加上 is .即 but practice is the key to it.