2. 专升本
  3. ______for your encouragement, I’ d never have invented this machine.

______for your encouragement, I’ d never have invented this machine.

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问题 ______for your encouragement, I’ d never have invented this machine.
选项 A、Had it not
B、If it were not
C、If I had not been
D、Had it not been
答案D
解析
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