every a and every b ---obey the rules

来源：百度知道编辑：UC知道时间：2024/05/04 22:11:57

a had to
b have to
c has to
d must have to

句子的意思是：每个A和每个B都必须遵守规则。

B,因为这里用的是“and”，虽然every 后面应该叫的是动词的单数，但是用了and就该用复数，如果句子是用“or”，即every a or every b ，那就应该用C。

must与have to重复，have to已经是必须的意思。must也是必须的意思。

至于A，had是表示过去时，按句子的意思应该是每个a和每个b都应该遵守规则，这个遵守规则应该是一直都要遵守，是一般事态，而不是过去要遵守，现在就不要遵守了。

C

And连接几个单数主语，主语由each、 every、 no、 many等词修饰的时候，谓
语动词要用单数
Each boy and each girl is invited.
Every boy and girl is invited.
No boy and no girl is there now.

来自英语文章：http://estudy.yo2.cn/go/514574.html

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