正方形的边长是7厘米，周长是（ ）厘米；正方形的周长是12厘米，边长是（ ）厘米，面积是（ ）平方厘米。
28；3；9
Although ______ for many years, the two old sisters recognized each other at once.
A．having been separated
B．being separated
C．having separated
D．had been separated
斯宾格勒《西方的没落》
