冒昧的问一下题目,,前面好象没人问...不知道可不可以提问题....
要是斑竹方便,麻烦帮我解答一下,,谢谢...
Archaeologists study------ to trace ancient trade routes because such
tools are relatively rare,and each occurrence has a slightly different chemical
composition.
(a)which obsidan tools (b)obsidan tools (C)how obsidan tools (d)obsidan
tools are..我选的B作study的宾语,不对吗??HOW的用法是不是引导主语从句或者是放在动词后??那么放在动词后是做什么成分呢???能否讲一下HOW的用法,,,谢谢,谢谢