摘要： It's a custom in China to have some tea before the meal is served. It 做形式主语
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It's a custom in China to have some tea or other drinks before the meal ________ .
[ ]
A. serves
B. served
C. is served
D. to be served
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B. served
C. is served
D. to be served
It’s a custom in China to have some tea or other drinks before the meal ________ .
A. serves B. served C. is served D. to be served
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