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【題目】—Do you consider worthwhile for them to have made that experiment?
— Of course. After all, it has paid off.

【答案】it
【解析】句意:——“你認為他們做那個試驗值得嗎?” ——“當然了。畢竟，他們得到了回報。”it is worthwhile for sb to do sth“某人做某事是值得的”,是固定用法，答案為it。

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