tony is working at a bank ____ (a)at the moment (b)a year ago (c)since last year (d)for a year

问题描述:

tony is working at a bank ____ (a)at the moment (b)a year ago (c)since last year (d)for a year
谁会啊,快来教教我啊,被这个题搞晕了~~
可是正确答案是b呢,所以很纳闷

a