We could not have fulfilled the task in time if it______ for their help.

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问题 We could not have fulfilled the task in time if it______ for their help.

选项 A、was not
B、is not
C、had not been
D、has not been

答案C

解析 本题考查的是if引导的条件状语从句中所使用的虚拟语气。表示与过去事实相反的假设,所用的句式为:if+主语+had done,主语+would/should/could might+have done。如:If she had time,she should have gone with you.(如果她有时间,应该已经跟你一起去了。)表示与现在事实相反时使用的句式:从句用动词过去式/were,主句是would/should/could/might+动词原形。表示与将来事实相反:从句用动词过去式/were+to do,主句用would/should/could/might+动词原形。如:If he were to leave tomorrow,he would get to Beijing by Friday.(如果他会明天离开的话,他星期五之前就会到达北京。)此题选C项。
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