问题
选择题
A computer can only do ________ you have instructed it to do.
A．how
B．after
C．what
D．when
答案
答案：C
本题考查的是名词性从句作宾语的用法。此句的引导词既作连词又在宾语从句中充当一成分，故what最合适。
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A computer can only do ________ you have instructed it to do.
A．how
B．after
C．what
D．when
答案：C
本题考查的是名词性从句作宾语的用法。此句的引导词既作连词又在宾语从句中充当一成分，故what最合适。