题干
—I’m sorry, I shouldn’t have been so rude to you.
—You________ your temper but that’s OK.
A：have lost
B：had lost
C：did lose
D：were losing
答案(点此获取答案解析）
C
A：have lost
B：had lost
C：did lose
D：were losing
，在A处放置一个质量为m的物体，现绕O点缓缓抬高A端，直到当木板转动到与水平面成α角的过程中，物体始终处于静止，在整个过程中（ ）