23-24高一上·全国·课后作业
1 . Something ________ have happened to Mary—She’s been crying all morning. (Possibility) (用适当的词填空)
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2 . Paul did a great job in the speech contest. He must ________ (practise)many times last week. (所给词的适当形式填空)
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3 . — Mary's score on the test is the highest in her class.
— Really? She________ have studied very hard. (用适当的词填空)
— Really? She
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