Question

There is a boy___there. A.swim B.swims C.swimming

Answer 1

答案是: C.swimming
There is a boy_swimming__there.

因为 is 是现在进行式

Answer 2

swimming

有一个小男孩在那里游泳

Answer 3

C 这句话里已经有谓语is了，此处需要非谓语。