【題目】Noise pollution has been a problem in my hometown_________.

A.since thenB.in the futureC.once a weekD.in the past

【答案】A

【解析】

句意:從那時起,噪聲污染就一直是我家鄉(xiāng)的一個難題。

考查時間狀語。since then從那時起,常與現(xiàn)在完成時搭配;in the future在將來,常與將來時搭配;once a week一周一次,表頻率,可以用于一般現(xiàn)在時、一般將來時或一般過去時;in the past在過去,常與一般過去時搭配。此句時態(tài)是現(xiàn)在完成時。故選A。

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