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Analyst blamed May´s sluggish retail sales on unexciting merchandise as well as the weather, colder and wetter than was usual in some regions, which slowed sales of barbecue grills and lawn furnitures.
A.colder and wetter than was usual in some regions, which slowed
B.Which was colder and wetter than usual in some regions, slowing
C. ...
D. ...
E. ...
官方答案是B,但我对于B选项中出现的Slowing表示不理解,请问为什么slow在这里要用-ing形式?
多谢?
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