________scientists have observed increased pollution in the water supply.

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问题 ________scientists have observed increased pollution in the water supply.

选项 A、Late
B、Later
C、Latter
D、Lately

答案D

解析 A“Late”形容词,表示“迟的,迟到的”;B“Later”是副词,表示“后来,以后”;C“Latter”为形容词,表示“后面的”;D“Lately”是副词,表示“最近”,根据题句中所用的现在完成时结构。
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