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------,I think,and all the problems could be settled.

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------,I think,and all the problems could be settled.
A.If you make more efforts
为什么A是错的?
------,I think,and all the problems could be settled.
英语中句子分为3种类型：简单句,并列复合句（简称并列句）,主从复合句（简称从句）.
从句分为三种：名词性从句（主语从句,表语从句,宾语从句,同位语从句）,形容词性从句（即定语从句）,副词性从句（即状语从句,状语从句一共九种,其中包括条件状语从句）.
由一个并列连词连接的两个简单句,就叫做并列句；由一个从属连词（或和从属连词有同样功能的词：如连接代词 连接副词等）连接的2个简单句,就叫做复合句.
如楼主题所写,首先I think 是作为插入语的,用逗号隔开,做题的时候可以不考虑它；其次if是从属连词,and是并列连词,在两个简单句中不能使用两个连接词.
所以答案A是错的.
正确的答案应该是 ---Make more efforts---,and all the problems could be settled.考查的是 祈使句+and/or+陈述句 结构.
当然and连接的并列句也可以转换成if引导的条件状语从句：If you make more efforts,all the problems could be settled.(专业回答,希望楼主采纳)
------,I think,and all the problems could be settled. ___,I think ,and the problems could be settled. ------,I think,and all the problems could be settled.A.If yo ______,I think,and the problems can be settled. ______,I think,and the problem could be settled soon. ----,i think,and the problem could be settled. ______,I think ,and the problem could be settled. A bit more efforts,I believe,and all the problems could be s Don’t worry! All the problems will be settled ________ we jo with all the problems settled ,i felt a great weight taken o -------,and the probiems could be settled.A if you double yo ———（在努一把力）and the problem could be settled.（effort）怎么做?