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When I ________ home, I caught a thief stealing from a passer­by.
A．headedB．was heading
C．has headedD．had headed
B
B 考察動(dòng)詞時(shí)態(tài)。句義：正當(dāng)我往家走的時(shí)候，我發(fā)現(xiàn)一個(gè)小偷在偷路人的東西。根據(jù)句義可知本句敘述的是在過(guò)去某個(gè)時(shí)間正在發(fā)生的動(dòng)作，所以使用過(guò)去進(jìn)行時(shí)。故B正確。
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