第28题: [单项选择]The hijackers should have been arrested ______ instead of being allowed to leave. A. on the spot B. on the side C. in the sight D. on the screen 参考答案:A 答案解析:本题测试短语辨析。on the spot 意为“当场”;on the side 意为“作为兼职,另外”;C 和 D 选项均不是固定搭配。本句大意为:本应当场逮捕劫持犯而不应允许他们离开。