___they are most interested in is ____they can produce more and better cars A that ;howB what;how C what ;what D that ;that为什么选B
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___they are most interested in is ____they can produce more and better cars A that ;howB what;how C what ;what D that ;that为什么选B
___they are most interested in is ____they can produce more and better cars A that ;how
B what;how C what ;what D that ;that
为什么选B
___they are most interested in is ____they can produce more and better cars A that ;howB what;how C what ;what D that ;that为什么选B
首先,要分清楚句子结构：
本句主干主语部分为“____ they are most interested in ”,谓语为is,表语部分为“____they can produce more and better cars”,而be interested in后面又缺少宾语,用what做be interested in的宾语,并引导主语从句.
第二空,表语从句中不缺宾语（因为有cars）,不缺主语（因为有they）,故不用what；缺少方式状语,否则意思不完整,故不用that而应用how.
故选B.
整句话的意思是：他们最感兴趣的是：怎样才能生产更多、更好的汽车.
what they are most interested in is……是一个主语从句，但是后面一句按照翻译应该用how，全句翻译就是他们最感兴趣的就是如何生产更多更好的汽车
what -----how
what 在句子做成分，is后面一部分的内容就是前面what的成分。
他们最感兴趣的就是他们如何生产更多更好的汽车。