—What’s your plan for this winter vacation?—I’ll take an express train to Shanghai for my

问题补充：

—What’s your plan for this winter vacation?

—I’ll take an express train to Shanghai for my holiday school ends.

A. hurriedly

B. soon

C. immediately

D. since

答案：

A. hurriedly

B. soon

(答案→)C. immediately

D. since

解析：句意，这是两个人之间的对话。第一个人说：“这个寒假你有什么计划？” 第二个人说： “学校一放假我就搭乘特快火车去上海。” 这里需要一个连词来引导时间状语从句，表示“一……就，故只能用immediately。