单项选择 适中0.65 引用1 组卷97
That naughty boy will keep pulling the cat’s tail ______ you stop him.
| A．as | B．since | C．if | D．unless |
23-24高一上·全国·期末
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You’d better make extra copies of this important file, _____ you need it for future reference.
| A．unless | B．in case | C．as if | D．even if |
________ persistent efforts, you will be able to speak fluent English.
| A．If making | B．While making | C．Unless made | D．Once made |
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