请问that 代表什么,and often do 是什么成分

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请问that 代表什么,and often do 是什么成分
the rate do B would be twice that for A.
还有一个问题,
the temperature control problems can and often do occur.
怎么翻译,and often do 是什么成分,do 和 occur 都是动词,能连用吗,
the rate of B would be twice that for A.
改成the rate of B would be twice that of A.可以吗

第一个问题中that代替the rate
第二个问题中, （can and often do occur中）and是连词,让can和do两个词并列（都相当于助动词（情态动词）,do单独列出时指强调）再加上occur一起作谓语. 而often是状语,放在助动词（情态动词）与实意动词之间.

请问that 代表什么,and often do 是什么成分请问Do your work in the way that I have shown you.that是什么成分什么意请问这句话中that作什么成分?引导的是什么从句? 这是什么从句?that做什么成分? you will be glad to hear that 中to hear 做什么成分啊 that是什么从句请问请问划线句子是什么从句,两个that都代表了什么,分析下句子 some people argue that and that 其中后面的that充当什么成分 what do you mean by say that 的by say that是什么成分英语中句子各成分的字母简称是什么?比如说S代表什么,O代表什么? How often do you do that? I often do that ____a day ,in the morning and in the evening Do you learn English that way?怎样译?that way做什么成分