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【题目】I think it will be difficult ___ a robot ____ the same things as a person.

A. as, to do B. for, to do

C. for ,doing D. as, doing

【答案】B

【解析】

试题句意:我认为对于机器人来讲,要和人做同样的事情难。本句的宾语从句里是一个不定式作主语的句子,其基本结构是:It be +adj. + for sb. + to do sth.即用it作形式主语,后跟带to的不定式作句子真实的主语,并常用介词for引出不定式的逻辑主语跟在不定式之前。故选B

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