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

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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