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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
考查動詞的語態(tài)。主語His invention和動詞consider之間是動賓關系，所以要用一般過去時態(tài)的被動語態(tài)，排除A,B；consider在句中作認為講，consider sth. to be …認為……是……。所以選C。
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