题干
—Does your sister ___________ a CD ?
—Yes, she ___________.
A：have; has
B：have; does
C：has; has
D：has; have
答案(点此获取答案解析）
B
—Does your sister ___________ a CD ?
—Yes, she ___________.
A：have; has
B：have; does
C：has; has
D：has; have
2NO+O2 在体积不变密闭容器中反应，达到平衡状态的标志是：