题目

 It seems as if the sun ____ round the earth since it rises in the east and sets in the west.    A. circles   B. is circling   C. has been circling  D. were circling 答案：D一次数学竞赛准备了22支铅笔作为奖品发给一、二、三等奖的学生，原计划发给一等奖每人6支，二等奖每人3支，三等奖每人2支，后来改为一等奖每人9支，二等奖每人4支，三等奖每人1支，则获一、二等奖的学生总共有    人．