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His invention ______ of no use by the scientists of that time.
A.considered beingB.considered to be
C.was considered to be D.was considered being
C
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。
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