It rained today ________ since we arrived in Beijing.

It rained today ________ since we arrived in Beijing.
A、at the first time
B、in the first time
C、for the first time
D、on the first time
【正确答案】：C
【题目解析】：at the first time 第一次；B表达错误；for the first time 首次；D 表达错误；句意：自从我们到达北京以来，今天是第一次下雨。因此C符合题意。