8. The thief        when he was stealing the wallet from a woman. (happen)

當(dāng)小偷在偷那個(gè)婦女的錢包時(shí)，碰巧被注意到了。

8. happened to be noticed表過去發(fā)生的動(dòng)作，因此happen用過去式;happen to do sth.意為"碰巧發(fā)生……"。

題目來源：高考英語組合訓(xùn)練多項(xiàng)選擇+完成句子 > 組合訓(xùn)練5-6

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