Martin Cooper , a US researcher , was considered _______ the first cell phone .
A．inventedB．to inventC．having inventedD．to have invented
D
考查非謂語動詞。sb be considered to have done sth認(rèn)為某人過去做過某事。句意：Martin Cooper，美國研究者，被認(rèn)為第一個發(fā)明手機，
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