A． AlthoughB． WhetherC． SinceD． When

【C7】A．althoughB．becauseC．only ifD．when

【C13】A．althoughB．ifC．whenD．since

I have no idea______we met for the first time.A．thatB．whetherC．whatD．when

【C5】A．AlthoughB．ThoughC．DespiteD．Whereas

【C19】A．AlthoughB．AfterC．WhereD．Before

【C7】A．althoughB．whetherC．howeverD．despite