A(If) the experiment succeeds or fails, it will B(provide us) with valuable C(experience) which is essential to D(improving) our

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问题 A(If) the experiment succeeds or fails, it will B(provide us) with valuable C(experience) which is essential to D(improving) our future work.

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答案A

解析改为Whether。因为在从句中后面有个or，所以用Whether.

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成人本科学位英语

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