问题描述：
passive voice.
1,mary has to make dinner tonight.(这句是certainty/ability /possibility /necessity?)
2,Tom must do a lot of homework later because he did not finish it this morning.
1,mary has to make dinner tonight.(这句是certainty/ability /possibility /necessity?)
2,Tom must do a lot of homework later because he did not finish it this morning.
问题解答：
我来补答展开全文阅读