A:①③④
B:①②③
C:①②④
D:②③④
—_______. But this summer I plan to go to Shanghai Disneyland with my parents.
已知:Ⅰ.RCHO+R′CH2CHO →Δ稀氢氧化钠 +H2O(R、R′表示烃基或氢)
Ⅱ.醛与二元醇(如:乙二醇)可生成环状缩醛:
I want to go to the library ____(and/but) it is ten to seven.