题干
I ________ clean my room on weekdays. I have no time.
A：usually
B：ofte
C：hardly ever
D：alway
答案(点此获取答案解析）
C
；③
；④垂直于同一条直线的两条直线必平行吗？⑤一个数不是合数就是质数；⑥把门关上．