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(gòu)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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