题目内容
20.必须在下周一前上交关于学生学习压力的报告.Reports on students'study pressuresmust be handed in before next Monday.
分析 must be handed in before.
解答 答案:must be handed in before.主语reports是动词hand in 上交的承受者,构成被动关系,结合must必须,故用情态动词的被动语态---情态动词+be+过去分词,在…前用before,故答案是must be handed in before.
点评 情态动词的被动语态---情态动词+be+过去分词的呈现,各种类型的被动语态的构成要理解掌握.
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