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

考查連詞。when   當什么時候，since 自從，  until 直到，句意：現在已經一點了，我必須離開。外面正下雨呢，直到雨停了你在離開。所以選C。