题目

This morning I went to work in such a hurry that _____ the key to my office at home. A. forgot B. left C .missed D. lost 答案：B小文同学用如图所示的两种不同的方式将一货物搬运到同一辆汽车上，效率高的是图________，小文同学两次做的有用功的关系是________．