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

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