题目

—When did his parents pass away? —It was on April 14th________the earthquake hit Yushu County. A．what                                                  B．that   C．which                                                D．when 答案：D　考查定语从句。此句看似是一个强调句型，但根据对话提供的情景，上句问的是“时间”，下句只要回答出时间就行了，故后面是when引导的定语从句。

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