But for the accident, we ______ the task much earlier.

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问题 But for the accident, we ______ the task much earlier.

选项 A、should finish
B、should have finished
C、would finish
D、shall have finished

答案B

解析 本句是虚拟语气。词组but for: with out; if not for要不是,相当于if引导的非真实条件句。
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