【C19】A．AlthoughB．AfterC．WhereD．Before

A． AlthoughB． WhetherC． SinceD． When

【C15】A．AsB．AfterC．WhileD．Before

【C19】A．whichB．whatC．whereD．that

【C19】A．beforeB．afterC．onD．until

【C15】A．AtB．AfterC．Not untilD．Before

【C8】A．laterB．afterC．agoD．before