-- What’s your plan for this winter vacation?-- I’ll take an express train to Dalian for m

问题补充：

-- What’s your plan for this winter vacation?

-- I’ll take an express train to Dalian for my holiday school ends．

A. while

B. until

C. immediately

D. unless

答案：

A. while

B. until

(答案→)C. immediately

D. unless

解析：考查immediately 作为连词，意为：一……就。句意学校一放假我就乘快车去大连度假。所以选C。