【C5】A．untilB．onceC．afterD．since

【C17】A．untilB．sinceC．afterD．before

【C5】A．neverB．yetC．alreadyD．since

【C18】A．WhileB．OnceC．SinceD．Though

【C5】A．forB．withC．afterD．on

【C7】A．beforeB．untilC．afterD．since

A. Since B. OnceC. WhetherD. Although