Polite manners(A) in China demand that a person stands up(B) when anyone enters(C) a room or when an
问题描述：
Polite manners(A) in China demand that a person stands up(B) when anyone enters(C) a room or when an
找错
答
B
demand+宾语从句（从句谓语动词用should+动词原形,或者should可以省略）
should stand 或者stand.
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