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青书学堂: (1). (单选题) The plane was moving unsteadily through the air, and 1) __________ the passengers had fastened their seat belts,(本题5.0分)
题目
青书学堂: (1). (单选题) The plane was moving unsteadily through the air, and 1) __________ the passengers had fastened their seat belts,(本题5.0分)