A．AfterB．BeforeC．SinceD．Behind

【C8】A．latelyB．beforeC．everD．never

A．unlessB．beforeC．thusD．until

A．afterB．beforeC．sinceD．till

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

【B4】A．afterB．beforeC．sinceD．when