______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

解析本题的四个选择项词形相似。late可以用作形容词，也可以用作副词，意为"迟，晚"。later是late的比较形式。latter当形容词用时，意为"较后的"；当名词用时，"the latter"指两者中之后者。lately是副词，意为"近来，最近"，是本题的答案。

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