After walking on the zigzag path to the mountain top for a few hours, the tourists gather

After walking on the zigzag path to the mountain top for a few hours, the tourists gathered under trees shade and down to have a rest.
A. provided; sit
B. providing; sitting
C. providing; sat
D. provided; sat

A. provided; sit B. providing; sitting(答案→)C. providing; satD. provided; sat解析：C　考查非谓语动词。句意：在通往山顶的蜿蜒小路上走了几个小时后，游客们都聚集在遮阴的树下，坐下来休息。“providing shade”是现在分词短语作后置定语，修饰trees；sat与gathered是并列的谓语动词，要保持形式上的一致。

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