问题
选择题
His invention ______ of no use by the scientists of that time．
A．considered being
B．considered to be
C．was considered to be
D．was considered being
答案
答案：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。