The introduction is always___a book.(in front of/in the front of)选择哪个呢谢谢啦麻烦说一下原因，两个选项一个是外部的，一个是内部的
问题描述：
The introduction is always___a book.(in front of/in the front of)选择哪个呢
谢谢啦
麻烦说一下原因，两个选项一个是外部的，一个是内部的
答
in the front of a book是指在书的前面部分,且在书里；而in front of a book是指在书的前方,与书不接触.