宋朝王安石《咏梅》诗：“墙角数枝梅，凌寒独自开。遥看不是雪，唯有暗香来。”能正确解释暗香来的化学道理是                                （ ）

A分子间有一定间隙                    B分子保持物质的性质

C分子在不停运动                      D分子是由原子构成

When we were young, every evening we ____ stay at home waiting for our mother. [ ]

A. would

B. might

C. should

D. could