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第1题

Watch your step， _____ you might fall into the water. 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. A. which B. as C. until D. unl
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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. A. excep
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第4题

The students didn’t manage to work out the problem ______ their teacher had explained how. A. when B. until
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