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[单选题]When we use the verb ‘have’ in its modal form: ‘have to’ meaning an obligation,  the vowel sound in the word ‘to’ changes to ________.aIe答案窝(daanwo.com)-大学生作业答案及考资分享平台
A/æ/aIe答案窝(daanwo.com)-大学生作业答案及考资分享平台
B/ə/

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