A：①②
B：②④
C：③④
D：②③④
My sister likes playing the guitar, but she can't play ______.
We have been in the school ______ three years ago and Mrs. Lee Has taught us English_______ three years.
节假日高速路免费在给人们带来实惠的同时，也加剧了拥堵。有人认为应该取消免费，也有专家指出，高速路应该利用价格杠杆调控车流量，平时降低费用或者实行免费，假期反倒可以收费。从哲学上看，这表明（ ）
①价值判断往往因人而异②真理总是不断被否定
③联系具有普遍性和多样性④事物的发展是辩证的否定
