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

 

C

【解析】

試題分析：考查固定句型。句意：據(jù)說(shuō)在過(guò)去的這段時(shí)間里核輻射成為日本大地震后最大的健康挑戰(zhàn)；be said to have done據(jù)說(shuō)已經(jīng)成為。。，故選C項(xiàng)

考點(diǎn)：考查固定句型

 

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