题干
—Laura didn't join in their dancing last night，did she?
—________，because she fell off her bike and hurt her legs
A：Yes，she
B：No，she didn't
C：Yes，she didn't．
D：No，she did
答案(点此获取答案解析）
B
，
，
，
，
，猜想第
个等式应为 （ ）