I saw him     when I passed by.
A．ranB．to runC．runningD．run
C

試題分析：句意：當我經(jīng)過時我看到他正在跑步。see sb. do sth.看到某人做某事，看到了全過程；see sb. doing sth.看到某人正在做某事，看到了正在進行的動作，故選C。
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