gwd 4-30

Data gathered by weather satellites has been analyzed by scientists, reporting that the Earth’s northern latitudes have become about ten percent greener since 1980, due to more vigorous plant growth associated with warmer temperatures and higher levels of atmospheric carbon dioxide.

1. Data gathered by weather satellites has been analyzed by scientists, reporting that the Earth’s northern latitudes have


2. Data gathered by weather satellites has been analyzed by scientists, and they report the Earth’s northern latitudes as having


3. After analyzing data gathered by weather satellites, scientists report that the Earth’s northern latitudes have


4. After analysis of data, gathered by weather satellites, scientists report the Earth’s northern latitudes as having

     E   After data gathered by weather satellites was analyzed by    scientists, who report that the Earth’s northern latitudes have

答案是D，为什么不能选C,  谢谢

应该选C.如果是D的话，After analysis of data, gathered by weather satellites, 到底是谁被gathered就不清楚了