______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 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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