—When did your brother begin to show his interest in medicine.
—It was a Saturday _____ he noticed his classmate experimenting on a frog in the lab.
A．thatB．whatC．when D．which
C

試題分析：考查定語從句。該定語從句的先行詞是a Saturday，關系詞在從句中作時間狀語，所以用關系副詞when。句意是; --你哥哥是什么時候開始顯示出他對醫(yī)學的興趣。--是在一個星期天，當時他看他同學給青蛙做實驗。選C。該題考生常誤選that，認為是強調句型。
考點:考查定語從句
點評;解答有關定語從句題目的關鍵是：先找出先行詞，然后把先行詞代入從句中，判斷其在從句中的地位和作用。
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