______scientists have observed increased pollution in the water supply.A、LateB、

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

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