题目

Do you remember a certain occasion ________ you were in trouble and at that moment I gave you a hand? A ． which B ． that C ． when D ． where 答案： C 【解析】 【详解】 考查定语从句。句意：你还记得有一次你有困难的时候，我曾帮助过你吗？此处为定语从句修饰先行词 occasion ，先行词在从句中作时间状语，故用关系副词 when 引导。故选 C 。

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