用 used to 造句.

发布时间：2021-03-12 12:14:06

用 used to 造句.

网友回答

I use to puter yestesday
======以下答案可供参考======
供参考答案1:
The central posite design (CCD) was used to obtain the experimental design matrix, first applied to discover the optimal working conditions for selective separation.
供参考答案2:
I used to play football。我以前常踢足球
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