2. 专升本
  3. AIf the experiment succeeds or fails, it will Bprovide us with valuable Cexperience,which is essential to Dimproving our future

AIf the experiment succeeds or fails, it will Bprovide us with valuable Cexperience,which is essential to Dimproving our future

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问题 AIf the experiment succeeds or fails, it will Bprovide us with valuable Cexperience,which is essential to Dimproving our future work.
选项 A、 
B、 
C、 
D、 
答案A
解析 应改为Whether。if不能引导主语从句，而whether可以。
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