---Why does the boy bring a chair here?
题型：选择题
问题：
---Why does the boy bring a chair here?
---Because the bookshelf(书架) is half a metre __________ his head. He has to stand on it to get the books on it.
A．above
B．under
C．on
D．behind
---Why does the boy bring a chair here?
---Because the bookshelf(书架) is half a metre __________ his head. He has to stand on it to get the books on it.
A．above
B．under
C．on
D．behind