【C10】A．whileB．beforeC．untilD．after

【C12】A．whenB．thoughC．untilD．for

【C10】A．whenB．afterC．untilD．while

【C9】A．whenB．ifC．untilD．after

【C12】A．beforeB．unlessC．untilD．once

【C15】A．AtB．AfterC．Not untilD．Before

【C10】A．whileB．whenC．thatD．which