For the【C1】______month, mysterious falls of large chunks of ice(冰雹) 【C2】______rained down on Spain and Italy. Juana Sanchez, a 7

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问题     For the【C1】______month, mysterious falls of large chunks of ice(冰雹) 【C2】______rained down on Spain and Italy. Juana Sanchez, a 70-year-old woman in Almeria, southern Spain, was knocked【C3】______when she was struck on the shoulder by a falling ice chunk【C4】______she walked in a street【C5】______her home. On January 12, just about 200 miles away in Seville, a man narrowly【C6】______serious injury when a 9-pound ball of ice【C7】______into his car.【C8】______the evening of January 27 priests at the Salesian monastery in L’Aquila, Italy were startled by a loud crash.【C9】______the noise, they discovered a large chunk of ice on their yard, 【C10】______intact . Upon examination, the block of ice【C11】______in at 2 kilograms and no source【C12】______. On the same day, about 100 miles northeast in Ancona, Italy, the local officials were called to investigate the report of a man【C13】______was struck【C14】______the head by a 1 kilogram chunk of ice that apparently fell from the sky.
    Spain and Italy aren’t the only European【C15】______getting attacked by huge ice blocks in January. On January 2 in Surrey, England(southwest of London), an East Indian man was walking through Newton Athletic Park when he【C16】______a strange whistling sound overhead. Seconds【C17】______, a large hunk of ice fell out of the clear blue sky and pounded into the soft ground, shattering over a 50-foot-wide area. The ice dug a hole of a foot deep and a foot in diameter. Even the shattered remains of the mystery ice were as large as tennis balls and were described as opaque【C18】______no unusual color or smell.
    Although eyewitnesses to the phenomenon report that they did not see anything in the sky that could account【C19】______the ice, scientists had to come up with a rationalization. Professor Jesus Martinez Frias, the geologist investigating the ice falls in Spain, told BBC News that the ice pieces had probably been【C20】______through sudden temperature drops in the stratosphere. This was the most likely explanation, he said, for the "very unusual" phenomenon.
【C12】

选项 A、determined
B、has determined
C、was determined
D、had been determined

答案C

解析 句子意思是冰块的来源不能被确定,应该用被动语态,而这里讲述的是过去的动作,需要用一般过去时,故选C。
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