A-A+
A．Because he was too old to see who did it.B．B
问题详情
A．Because he was too old to see who did it.
B．Because the boys ran too fast for him to catch.
C．Because it was impossible for him to he on guard all the time.
D．Because he was too kind to beat the boys.
参考答案
正确答案：C
解析：题目问为什么Mr. Flowers不能防止玻璃房被损坏。短文中提到“However，it was not convenient or possible to be on guard all the time"，可见要整天看守不方便也不大可能，不这样做就难以防止玻璃房被破坏，C) 与此相符。
