Question

In my opinion, life in the twenty-first century is much easier than ________．

[　　]

A．

that used to be

B．

it is used to

C．

it was used to

D．

it used to be

Answer 1

答案：D
解析：

used to意为“过去常常”，可看作半助动词或情态动词，其后跟动词原形，表示过去的习惯、经常发生的动作或状态。此题中的it代替life。