— Did you see the boys yesterday afternoon?
— Yes. I saw them ________ the fence when I passed.
A．climbB．climbedC．to climbD．climbing
D
考查分詞用法。See sb doing sth看見某人正在做某事；根據(jù)when I passed可知是在過去的一個(gè)時(shí)間點(diǎn)上發(fā)生的事情，那么應(yīng)該是指正在進(jìn)行的事情。句意：當(dāng)我經(jīng)過的時(shí)候，我看到他們正在爬籬笆。
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