4G主资费套餐：老客户改套餐，（）生效。
A.当月
B.下月
C.两个月后
D.半年后
参考答案：B
Every evening after dinner, if not _____ from work, I will spend some time walking my dog. [ ]
A. being tired
B. tiring
C. tired
D. to be tired
I’d rather ________ than _________
A．watch TV, go to the cinema
B．watching TV, going to the cinema
C．to watch TV, go to the cinema
D．watch TV, to go to the cinema
