A．afterB．beforeC．sinceD．till

A．AfterB．BeforeC．SinceD．Behind

John fell asleep he was listening to the music.A．afterB．beforeC．whileD．as soon as

Were working______the clock to accomplish the proposal before Tuesday.A．afterB．beforeC．aga

I worked _____12 last night. Of course, _____then I was really tired.A. till, afterB. at

A．inB．asC．toD．till

【B4】A．afterB．beforeC．sinceD．when