[题目]You must work hard, you will fall behind.A. and B. but C. so D. or 题目和参考答案——青夏教育精英家教网—

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【题目】You must work hard, _____ you will fall behind.

A. and B. but C. so D. or

【答案】D

【解析】试题分析：or“否则、要不然”（位于句首、且在肯定句中）故选D.

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