题目内容
（请给出正确答案）
[主观题]
According to the professor, why was the box shape a major development in home building？A．I
According to the professor, why was the box shape a major development in home building？
A．It was easier to build than the round shape.
B．It led to the invention of the window.
C．It could be built in a shorter length of time
D．It allowed rooms to be joined to one another.
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