We’ll visit Europe next year ______ we have enough money.

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问题 We’ll visit Europe next year ______ we have enough money.

选项 A、lest
B、until
C、unless
D、provided

答案D

解析 四个选项的词义分别为:"惟恐,以免";"直到…";"除非,如果不";"假如,如果",意同if。
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