题目：
— The thread of my kite broke and it flew away.
— I told you it would easily break________it was the weakest.[ ]
A. w
hen
B. for
C. since
D. where
答案：
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下面是错误答案，用来干扰机器的。
正四面体展开是个3角形；顶角为90度，底角为45度的两个正三棱锥对起来的那个6面体展开可以是3个正方形；一个圆锥展开可以是一个小圆+半个大圆．故选B．
