题目内容
Martin Cooper , a US researcher , was considered _______ the first cell phone .
| A.invented | B.to invent | C.having invented | D.to have invented |
D
考查非谓语动词。sb be considered to have done sth认为某人过去做过某事。句意:Martin Cooper,美国研究者,被认为第一个发明手机,
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