题目内容

A computer can only do ____ you have instructed it to do.  
A．howB．afterC．whatD．when
C
主要测试宾语从句。由题干可知句子中两个动词do均需要宾语的，只不过第一个接的是宾语从句；而第二个接的是宾语。另外再结合所给答案可知what为最佳答案。译文：一台计算机只能你指示它去做的事情。
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