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

分析 計(jì)算機(jī)只能做你指示它做的事情．

解答 C 考查賓語(yǔ)從句．分析提干信息可知you have instructed it to do是動(dòng)詞do的賓語(yǔ)從句，賓語(yǔ)從句中to do沒(méi)有賓語(yǔ)，連接詞應(yīng)該用what引導(dǎo)，what在從句中做do的賓語(yǔ)，所以答案選C．

點(diǎn)評(píng) 賓語(yǔ)從句屬于名詞性從句中的一種，也是學(xué)生們需要掌握的一種基本的英語(yǔ)句型，引導(dǎo)名詞性從句的連接詞選擇是考試的重點(diǎn)，學(xué)會(huì)分析從句的句子成分是解決名詞性從句的解題關(guān)鍵．

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