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19．I admire my English teacher．I can remember very few occasions     she stopped working because of ill health．（　�。�
A．thatB．whenC．whereD．which

分析 我很佩服我的英語老師．我記得她幾乎沒有因為身體不好而不上班的時候．

解答 答案：B  題干中she stopped working because of ill health修飾名詞occasions，是一個定語從句；從句中結構完整，要用關系副詞；when表示時間，where表示地點；句意表達的是時間，故選B．

點評 定語從句是用來修飾名詞的形容詞性從句，相當于一個形容詞．連接定語從句的引導詞分為關系代詞和關系副詞，關系代詞在從句中要作主語或賓語；關系副詞在從句中作狀語．這也是選擇關系詞的一個判斷方法．

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