核心问题
There are three windows ____ the wall. A. on B. in C. against D. at
词典解答
选A是错误的，应当选B，因为窗户是“在墙内”，而不是“在墙的表面上”，见 。
There is some dust ____ the mirror.
A. on B.at C.in D.about
There are three windows ____ the wall. A. on B. in C. against D. at
选A是错误的，应当选B，因为窗户是“在墙内”，而不是“在墙的表面上”，见 。
There is some dust ____ the mirror.
A. on B.at C.in D.about