摘要： 把主动语态变为被动语态时.其谓语动词的时态要与原句时态保持一致.其谓语动词的数要与新主语保持一致. We have bought a new computer. 我买了一台新电脑. →A new computer has been bought.
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把下列句子变为被动语态：
The students must hand in their English exercise books before they leave school.
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