Recently, there have been many occasions ______ you have attended events on your own.

A. where B. which C. when D. why

C

【解析】

試題分析：考查定語從句。定語從句“you have attended events on your own”不缺少成分，排除B；occasion時刻，場合，機(jī)會，先行詞指時間，且定語從句不缺少主語或賓語，用when引導(dǎo)定語從句，故選C。

考點：考查定語從句

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