问题
选择题
In my opinion, life in the twenty-first century is much easier than ____.
A．what used to be
B．that it used to be
C．it used to be
D．what it used to be
答案
答案：D
考查宾语从句。used to do“过去（常常）”；be缺少表语，用what；句意“在我看来，21世纪的生活比过去的生活容易的多。”。故选D。