.. Department of Homeland Security and CIA produced joint report on Monday warning that

.. Department of Homeland Security and CIA produced joint report on Monday warning that next 911 could in fact occur on different date.
A. the; a; the
B. a; the; a
C. /; the; the
D. a; /; the

A. the; a; the(答案→)B. a; the; aC. /; the; theD. a; /; the解析：考查冠词的用法。“国土资源局和中央情报局在周一发布了一个联合报告，警告说下次911事实上会在一个不同的日期发生。”泛指一份报告用a，排除A、C；特指下次911事件用the，排除D。故选B。

这个解释是对的