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问题: 选什么?为什么?

_______ in the fields on a March afternoon, he could feel the warmth of spring.
A. To walk. B. Walking
C. Walked D. Having walked

解答:

B
could feel是谓语动词,句首选填非谓语动词。
考虑时间先后和主动被动关系。“走路”是主动,走的同时感觉到春天的温暖,所以用Walking。
A表目的,C被动,错,D表明前半句先发生,与事实不符