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．a(chǎn)ren't decided

答案：A解析：何時何地建造還沒有被決定，所以用被動語態(tài)。強調的是結果，故用完成時。when and where 應看成一個整體概念，謂語動詞用單數(shù)形式。

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