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11、        the Department of Homeland Security identified more than 7,000 sensitive dates spanning the next 20 years, it did manage to rule out several dates as future 9/11s.

A.Since         B.Because           C.Though            D.When

11、C

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        the Department of Homeland Security identified more than 7,000 sensitive dates spanning the next 20 years, it did manage to rule out several dates as future 9/11s.

A.Since         B.Because           C.Though            D.When

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