2. 外语
  3. ____scientists have observed increased pollution in the water supply.

____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 各项的意思是：Late是形容词，表示“迟的，迟到的”；Later是副词，表示“后来，以后”；Latter为形容词，表示“后面的”；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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