【題目】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】

試題分析:句意:認為對于機器人來講,要和人做同樣的事情難。本的賓語從句里是一個不定式作主的句子,其基本結(jié)構(gòu)是:It be +adj. + for sb. + to do sth.即用it作形式主語,后跟帶to的不定式作句子真實的主語,用介詞for引出不定式的邏輯主語跟在不定式之前。故選B。

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