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

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

选项 A、If
B、provide us
C、experience
D、improving

答案A

解析 (whether)因为在从句中后面有个or,所以用whether。
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