______ he was exercising at the park yesterday morning, he found a purse under the tree.
A. While                           B. Before                            C. Though
A

試題分析：句意：昨天早晨，當(dāng)他正在公園鍛煉的時(shí)候，他發(fā)現(xiàn)樹下有一個(gè)錢包。分析選項(xiàng)：while當(dāng)……時(shí)候；before之前；though雖然。聯(lián)系句意為當(dāng)……時(shí)候。故選 A
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