题目

Danby left word with my secretary ________he would call again in the afternoon .     A. who             B. that         C. as             D. which 答案：B一批零件200个，一个工人每小时做10个，用关系式表示人数y（个）与完成任务所需的时间x（小时）之间的函数关系式为 ．