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13．A computer can only do ________ you have instructed it to do．（　�。�
A．howB．afterC．whatD．when

分析 計算機只能做你指示它做的事情．

解答 C 考查賓語從句．分析提干信息可知you have instructed it to do是動詞do的賓語從句，賓語從句中to do沒有賓語，連接詞應該用what引導，what在從句中做do的賓語，所以答案選C．

點評 賓語從句屬于名詞性從句中的一種，也是學生們需要掌握的一種基本的英語句型，引導名詞性從句的連接詞選擇是考試的重點，學會分析從句的句子成分是解決名詞性從句的解題關鍵．

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