norwaywinter

(D) because of moisture that was exhaled by tourists raising the humidity within them to levels so high as to make the salt from the stone crystallize
先看raising那一串。V-ing前面如果没有逗号，那它就是形容词作定语，就近修饰前方的紧邻名词tourists。那后面的them就也是指代tourists的了。整个句子的层次应该是【because of mositure】，然后【that was exhaled by tourists】是定语从句修饰mositure，再然后【raising那一串修饰tourists】。但是，这个层次是从语义或者说逻辑角度看其实是错误的。。
(E) because moisture exhaled by tourists had raised the humidity within them to such levels that salt from the stone was crystallizing
exhaled在这里不是动词，是V-ed在做形容词，是后置定语。也就是说句子逻辑是【because moisture had raised the .....】
而是什么样的mositure呢？作者给了一个【V-ed的形容词来修饰】，是【tourists呼出的moisture】