A-A+
A．It was made of aluminum.B．It wasn't large en
问题详情
A．It was made of aluminum.
B．It wasn"t large enough.
C．It wouldn"t move the wind.
D．It was too heavy to put up.
参考答案
正确答案：D
解析：本题是细节题。从It said that the original was steel and it weighed so much that it wasn't safe to hang．可以得知原来的问题是重量太重，不安全。
