题目内容
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
答案:C
提示:
提示:
before引导的是时间状语从句,根据前后时态要一致的原则,从句中的谓语动词应用一般现在时,并且meal和serve是被动关系。
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