摘要:注意状语从句中从句的省略现象 (1)连接词 + 过去分词 Don’t speak until spoken to. Pressure can be incrased when needed. Unless repaired, the washing machine is no use. (2)连词 + 现在分词 Look out while crossing the street. (3)连词 + 形容词/其他 常见的有it necessary.if possible.when necessary.if any等.

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