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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