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第1题

Watch your step， _____ you might fall into the water. 选项: A:or B:and C:unless D:but
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第2题

I knew him better, _______ I discovered that my impression had been right. 选项: A:which B:as C:until D:unless
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第3题

--- Could I borrow your dictionary? --- I.d get it for you ______ I could remember who last borrowed it. 选项: A:exce
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第4题

The students didn.t manage to work out the problem ______ their teacher had explained how. 选项: A:when B:until C:unle
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