What surprised me most was to see some of the village people on the benches at the end of

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(答案→)A. seated
B. seating
C. seat
D. to be seating
解析：考查非谓语动词，此题考查see sth done,过去分词作宾补，句意：最使我吃惊的是看到一些村民坐在教室后面的长凳子上。Seat 坐，只有过去分词seated，没用现在分词形式seating，所以选A。