It is said in the book that Tomas Edison （1847-1931） _______ the world leading inventor for thirty years．
A．would be B．has been
C．wasD．had been
C
考查時(shí)態(tài)。根據(jù)句意可知書中陳述的事實(shí)為過去發(fā)生的，故用一般過去時(shí)，選C。
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