His invention of no use by the scientists of that timeA. considered beingB. considered t

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A. considered being
B. considered to be
(答案→)C. was considered to be
D. was considered being
解析：考查动词的语态。主语His invention和动词consider之间是动宾关系，所以要用一般过去时态的被动语态，排除A,B；consider在句中作认为讲，consider sth. to be …认为……是……。所以选C。