在下列四个方程中，X1、X2、X3和X4各代表某种粒子. ① ② ③ ④ 以下判断正确的是( )
Mum， I （finish） practising the piano． May I go to play football now？
The restaurant offers good service to all its （顾客）．
I couldn't fall asleep because the bed was too （不舒服的）．
He （误以为） Mary for her twin sister and that made them laugh a lot．
（在……期间） his stay in Beijing， he made some foreign friends．
粤公网安备 44130202000953号