概念1在句子中修饰名词或代词，定语从句在句中充当定语。2定语从句必须有先行词，并尽量靠近先行词。3在定语从句中，关系词在从句中充当成分。Correctmistakes1Isawsometreesleavesofwhichwereblackwithdisease2Hereisthepe
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