单选题 Whether they can finish the task before this Friday depends on which method they will ＿＿＿＿＿＿＿＿ to the experiment. 的答案

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题目内容：
Whether they can finish the task before this Friday depends on which method they will ＿＿＿＿＿＿＿＿ to the experiment.
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