题目

We once had a poster competition in our fifth grade art class．    “You could win prizes，”our teacher told us as she wrote the poster information on the blackboard．She passed out sheets of construction paper while continuing，“The first prize is ten dollars．You just have to make sure that the words on the blackboard appear somewhere on your poster．”     We studied the board critically．Some of us looked with one eye and held up certain colors against the blackboard，rocking the sheets to the right or left while we conjured up our designs．Others twisted their hair aroIt’s very hot, we decide _________ in the pool.A. swimming B. swimsC. to swim D. to swimming