In my opinion，life in the twenty－first century is much easier than ________.A．th
题型：不详难度：来源：
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 |
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答案
| D |
解析
| 表示 “过去常常……”用“used to do”。本题中“be”为连系动词，不是实义动词，不能省略。 |
举一反三
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