Bike mustn’t _____ everywhere.
A. be up
B. be put
C. put
D. putting
查看答案
All trees must _____well when it is dry.
A. be water
B. watering
C. water
D. be watered
The old man and the children_____ in our country.
A. must take good care
B. must be take good care of
C. must take good care of
D. must be taken good care of
微信支付 
支付宝支付