问题
选择题
The old man smiled when he saw how pretty__________up to be during the past few years.
A．had his daughter grown
B．would his daughter grow
C．his daughter would grow
D．his daughter had grown
答案
D
宾语从句后面用陈述语气。另外，根据时间状语during the past few years可判断，应用完成时态。