A book recording former Chinese President Jiang Zemin's overseas visits from 1990 to 2002 _______ at Beijing's Diaoyutai State Guesthouse．

A.had released

B.had been released

C.released

D.was released

答案及解析： D

考查动词语态。首先根据题干只能用过去时态，而book与release之间只能是被动关系。