题目内容
There will be no going back our decision is made.
| A．until | B．unless | C．once | D．before |
C
解析试题分析：A. until 直到，B. unless除非，C. once一旦， D. before在…前面，句意：一旦我们决定了，就不能再回头了。所以选C。
考点：考查连词辨析
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