The class ________ into three groups.
A.is dividedB.is separatedC.dividedD.separated在线课程A
解析：
把一个整体分成若干部分用divide sth. into… divide和 separate都有“分”的意思，但用法有所不同。divide指把整体分为若干部分。separate指把原来联合在一起或靠近的人或物分离开来。试比较： The apple was divided into two. 苹果被分为两半。Ten divided by two is five. 十除以二得五。In the US, the blacks and the whites were no longer separated in public places. (＝ In the US, the blacks were no longer separated from me whites in public places. )在美国，黑人和白人在公共场所不再隔离了。