问题补充:
Though to see us, the professor gave us a warm welcome.
A. surprising
B. was surprised
C. surprised
D. being surprised
答案:
A. surprising
B. was surprised
(答案→)C. surprised
D. being surprised
解析:考查省略结构和非谓语。这里把句子补完整就是:Though he was surprised to see us ……,主语一致,分词作状语 省略主语和系动词。用being done的结构一般是解释为“正在被做……”显然这里用这个解释不通。