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H1N1 is said one of the biggest challenge to the people in the world today. A. t

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H1N1 is said one of the biggest challenge to the people in the world today. A. t

(  ) H1N1 is said ______ one of the biggest challenge to the people in the world today.

A. that it is   B. to had been   C. that it has been   D. to have been

试题答案

D

标签：biggestthetochallengeof

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