题目内容
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
D
表示“过去常常……”用used to do……，并且本题中动词原形be不能省略。
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题目内容
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
D
表示“过去常常……”用used to do……，并且本题中动词原形be不能省略。