Professor Wang is going to give us a lecture on the history of American literature, but when and where ____ yet. A: aren't decided B: hasn't been decided C: haven't decided D: haven't been decided

The city government is planning to build a new factory to deal with rubbish, but when and where to start ________. A: hasn't been decided B: haven't decided C: isn't being decided D: aren't decided

He hasn't decided ______. A: if he'll go on a trip to Wuxi B: when will he go on a trip to Wuxi C: if he goes on a trip to Wuxi D: when does he go on a trip to Wuxi

When and where to hold the meeting ________ yet. A: are decided B: decides C: have not decided D: has not been decided

When and where to go for a summer holiday （） yet. A: has not decided B: have not decided C: has not been decided D: have not been decided