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 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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