29._ it be Li Ping who broke the glass?No.It be Wang Ha

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29.___ it be Li Ping who broke the glass?No.It __ be Wang Hai who
did it.分析为什么选D而不选B.30.When the old man was alive,he__ sit for hours at the door.为什么选A而不选C.32.I have decided to take the job and I ___ change my mind.A.must not B.can not C.won not D.may not 分析为什么选C而不选B.
29，a,could may b,can can c,may must d,can must

29can be表理论上有可能
must be 表肯定猜测
30would过去总是做某事
32won't不会,强调主观意愿和决心（can not 不可能,否定猜测）

29.___ it be Li Ping who broke the glass?No.It __ be Wang Ha .___ it be Li Ping who broke the glass?No.It __ be Wang Hai ________ it be Li Ping who broke the glass?A Cou ~Who broke the glass? ~I suppose it must be one o It must be a thief broke the glass. Is it you who broke the glass is it you who broke the glass? The mother didn't know who ___ for the broken glass as it ha it ___ be Mr.J who is in the office.——No,it ____ be him.I sa It was _______ broke the glass. The village is no longer ___ it used to be. Li Ping and Wang Jin are the same age?等于Li Ping ____ ____ __