2. 专升本
  3. ______for their help, we would not have overcome the difficulties.

______for their help, we would not have overcome the difficulties.

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问题 ______for their help, we would not have overcome the difficulties.
选项 A、Weren’t
B、Had it not been
C、Hadn’t it been
D、Had it been not
答案B
解析 本句为虚拟语气。当条件句中省略连词if可将were，had，should等提到主语之前。
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