【題目】I soon s(發(fā)現(xiàn)) what the mistake was.

【答案】spotted
【解析】spotted 動(dòng)詞spot發(fā)現(xiàn);本句中該詞作為謂語動(dòng)詞,根據(jù)后半句中的was說明應(yīng)該使用一般過去時(shí)。

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