Several students were working _____the difficult math problem after class. - 初中英语试题 - 超级试练试题库

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Several students were working _____the difficult math problem after class.        [     ]
A. in
B. to
C. off
D. on

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试题【Several students were working _____the difficult math problem after class. 】；主要考察你对介词的分类等知识点的理解。[详细]

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Global warming leads _________the melting of ice caps.     [     ]
A. on
B. in
C. at
D. to

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基本语法选择合适的介词填空

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