—Excuse me, Mum. When can we have dinner?
—Not until it   in half an hour.

A．is preparedB．has been prepared
C．will be preparedD．was prepared

A

解析試題分析：句意：打擾了，媽媽。我們什么時候能吃飯？——知道半個小時后準(zhǔn)備好了才行。當(dāng)主句描述將來動作時，條件從句中一般用一般現(xiàn)在時態(tài)表示將來動作。從句主語是動作對象，故用被動語態(tài)，選A。
考點：考查時態(tài)及語態(tài)

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