All reference books ________， he didn't find the key to the question.A．being se_刷题宝

题干

All reference books ________， he didn't find the key to the question.

A．being searched	B．searched
C．to be searched	D．were searched

上一题下一题 0.64难度单项选择更新时间:2014-04-19 08:53:39

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