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

(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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