.The teaching building is by many trees some over 30 metres.A. surrounded measuringB.

问题补充：

.

The teaching building is by many trees, some over 30 metres.

A. surrounded, measuring

B. surrounded, measured

C. surrounding, measured

D. surrounded, measure

答案：

(答案→)A. surrounded, measuring

B. surrounded, measured

C. surrounding, measured

D. surrounded, measure

解析：be surrounded by“被。。。包围”measure “测量；估量”vt ,vi.测量；测量（大小，容量，尺寸等）some measuring over 30 metres的意思是“有些(量起来)高度超过30米