问题: 分析并翻译
The flowers his friend gave him will die unless ________ every day.
A． watered B．watering c．water D．to water
解答:
可以看作是The flowers his friend gave him will die unless they are watered every day. 省略了they are.另例：1）While he was walking in the street,he met Tim. → While walking in the street,he met Tim. 2）After he had finished his work,he left there.→Having finished his work,he left here.（当从句的主语与主句的主语一致时，可以这样把状语从句改为分词短语引导的状语，若不一致则要保留从句的主语，称独立主格结构。）
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