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        1. Because of the cold weather, half of the children________ill for a week.

          A.has beenB.have fallen
          C.have beenD.has fallen

          C

          解析試題分析:句意:由于這次冷空氣的原因,一個星期,有一半的孩子已經(jīng)生病了。分析:對現(xiàn)在造成的影響是孩子們生病了,體現(xiàn)現(xiàn)在完成時的用法,構成have/has done(動詞的過去分詞)。主語是children,因此助動詞為have.故選 C
          考點:考查動詞時態(tài)。

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