A．untilB．ifC．thoughD．since

【C3】A．that wheneverB．whetherC．that thoughD．since

【C5】A．untilB．onceC．afterD．since

【C12】A．AsB．As ifC．ThoughD．Unless

【C14】A．UntilB．IfC．WhetherD．Though

【C6】A．UnlessB．IfC．ThoughD．As

【C5】A．becauseB．ifC．thoughD．when