【題目】—When was first robot ? —In 1959.

A. a; invent B. the; invent C. a; invented D. the; invented

【答案】D

【解析】句意：-第一個機器人是什么時候發(fā)明的？-在1959年。a是定冠詞，表示泛指一個，修飾可數(shù)名詞單數(shù)；the是定冠詞，修飾名詞，表示特指；invent發(fā)明，是動詞原形；invented是過去分詞形式。first是序數(shù)詞，它的前面必須加定冠詞the；根據(jù)句意可知，機器人是被發(fā)明的，這里用被動語態(tài)，用be+過去分詞，故第二個空填過去分詞形式，選D。

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