Itiscoldintheroom.Theymusthaveturnedoffthesteam,­­­­­­­...

問題詳情：

It is cold in the room. They must have turned off the steam, ­­­­­­­­­­­­­­­_______?

   A. mustn’t they               B. haven’t they       C. didn’t they                D. have they

【回答】

B

知識點：疑問句 反義疑問句

題型：選擇題