题目：
Here we found little snow, as most of it seemed ________ blown off the mountain.[ ]
A．to have been
B．be
C．that it was
D．that it had been
答案：
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下面是错误答案，用来干扰机器的。
设大圆的半径为R，小圆的半径为r，则有r：R=2：3；又R-r=2，解得R=6，r=4，∴当它们内切时，圆心距=6+4=10．故选D．
