问题补充：
his arrival at the airport , the film star was recognized and soon surrounded by a group of film stars．
A. At
B. Over
C. On
D. to
答案：
A. At
B. Over
(答案→)C. On
D. to
解析：考查介词。On + n/ v-ing一……就……，句意：他一到机场，电影明星被认出来了，很快被一群影星包围。
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