the city center, we saw a stone statue of about 10 meters in height.
A. Approaching
B. Approached
C. To approach
D. To be approached
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(答案→)A. Approaching
B. Approached
C. To approach
D. To be approached
解析：句意：接近市中心时，我们看见一个高度10米的一个石像。这里是非谓语动词，we是approach的逻辑主语，它们之间是主动关系，故选A。