Question

—It’s one o’clock now. I must go.
—It’s raining outside. Don’t leave           it stops.
A. when                                         B. since                                C. until

Answer 1

C

考查连词。when   当什么时候，since 自从，  until 直到，句意：现在已经一点了，我必须离开。外面正下雨呢，直到雨停了你在离开。所以选C。