which school was suitable for their son, the parents visited lots of different primary schools in the city.
A. Finding
B. Being found
C. Found
D. To find
网友回答
A. Finding
B. Being found
C. Found
(答案→)D. To find
解析：句意：为了给儿子找到哪个学校是合适的，父母参观了城里的许多学校。这里find的逻辑主语是parents它们之间是主动关系，故排除BC，这里用动词不定式表示目的，故选D。