There is nothing more wonderful in the world than swimming with

There is nothing more wonderful in the world than swimming with a （ ）of fish around you.
A、sack
B、sheet
C、staff
D、school
【正确答案】：D
【题目解析】：a school of 一群；a sack of 一大袋，a sheet of 一张，staff职工。本句意为没有比游泳的时候有一大群鱼围绕着你更棒的事情了。