你可以把这个句子转化成陈述句后,在分析缺的是什么 this book is ()you are looking for 可以发现you are looking for 前少了先行词,that这类引导词在定语从句是可以省略的。 如果用that的话,让this book做先行词的话,句序就不是这样了,而是Is that the book you are looking for...
如果是Is this the book _______ you are looking for?(加了the),那么可以用that是可以的。但是如果没有the的话,你把它还原成陈述句读不通,this is book that,,,(book是可数名词,要么有冠词,要么用复数),如果加the,主语还原后就是this book is the one就读得通顺了. 分析的应该不错,希望选为满意答...
如果你用that,还原之后,就是this book is that you are looking for.你看一看这个对吗?如果用that,在这个句子里,that必须引导表语从句,而非定语从句,既是从句,其成分应该是完整的,可是用that的时候这个句子缺少宾语。所以不对。 用the one,你还原后是这样,this book is the one you are looking for...