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9．Nuclear radiation is said ____ the biggest health challenge in Japanese Earthquake over the past few months．（　　）

A．

being

B．

to be

C．

to have been

D．

that it is

分析在過去的幾個月里，日本地震中的核輻射據說是健康的最大挑戰．

解答答案：C
短語搭配be said to do sth據說做某事；句意表達的be動作發生在據說之前，要用不定式的完成式．故選C．

點評動詞不定式是非謂語動詞是一種，表示未發生的動作，用法較多．常用來作定語，主語，賓語，補語，狀語等．

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