题干
—Mum, I'm tired.
—Why not ________?
A：stop having a rest
B：to stop having a rest
C：stop to have a rest
D：to stop to have a rest
答案(点此获取答案解析）
C
细胞中染色体数2N=40）的生殖与发育过程中发生的一些重要变化。下列有关分析中，不科学是
n at any time, it is _______ best to call