—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(shí)候能吃飯？——知道半個(gè)小時(shí)后準(zhǔn)備好了才行。當(dāng)主句描述將來(lái)動(dòng)作時(shí)，條件從句中一般用一般現(xiàn)在時(shí)態(tài)表示將來(lái)動(dòng)作。從句主語(yǔ)是動(dòng)作對(duì)象，故用被動(dòng)語(yǔ)態(tài)，選A。
考點(diǎn)：考查時(shí)態(tài)及語(yǔ)態(tài)

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