【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】

試題句意:我認(rèn)為對(duì)于機(jī)器人來講,要和人做同樣的事情難。本句的賓語從句里是一個(gè)不定式作主語的句子,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(shí)的主語,并常用介詞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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