单选题

During the rainy season the Mississippi River may carry away hundreds of acres of valuable top soil from one area and arbitrarily deposit it in another.
A. subsequently B. lawfully C. mercilessly D. randomly
【正确答案】 D
【答案解析】arbitrarily随意地，任意地。randomly随便地。subsequently随后地，后来。law— fully守法地，合法地。mercilessly残忍地，无慈悲地。