2. 财务会计
  3. __________ your valuable help, we couhtn

__________ your valuable help, we couhtn

恬恬2019-12-17  18
问题 __________ your valuable help, we couhtn't have finished the experiment ahead of time．
选项 A.If it were not forB.  Had it not been forC.Were it not forD.If it has not been for
答案B
解析考查虚拟语气。本题是与过去事实相反的虚拟语气，如果省略if，句子要倒装，倒装时要将助动词提前，故选B。
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