Swimming in the pool with the children very interesting.A. hasB. haveC. isD. are

问题补充：

Swimming in the pool with the children very interesting.

A. has

B. have

C. is

D. are

答案：

A. has

B. have

(答案→)C. is

D. are

解析：句意：在游泳池里面和孩子们一起游泳非常有趣。联系上下文可知本句为系表结构，have不能用作系动词。句子主语是名词性从句Swimming in the pool with the children，抽象事物，不可数，故谓语动词用单数，选C。