it is a custom in china to have some tea or other drinks before the meal is
it is a custom in china to have some tea or other drinks before the meal (is served)为什么不填 will be served
人气：158 ℃ 时间：2020-04-04 05:16:05
解答
阐述一种一般状态而已,再说了 都用了before 没见过before后面用将来式的
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