【題目】For kids of this age, three hours of sitting in the classroom ________ too long. They should be allowed to go outside every 40 minutes.

A.isB.areC.were

【答案】A

【解析】

句意：對于這個年紀的孩子，在教室里坐三個小時太長了。應該每隔40分鐘允許他們出去一次。

考查主謂一致及系動詞辨析。is一般現(xiàn)在時的單數(shù)系動詞；are一般現(xiàn)在時的復數(shù)系動詞；were一般過去時的復數(shù)系動詞。敘述一般的事實，時間three hours作主語時，看作整體，謂語動詞要用單數(shù)，所以空格處填is。故選A。

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