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When _____ who is their best friends, the boys usually hesitate before responding.
A.askingB.askedC.askD.to ask
B
考查非谓语动词。逻辑主语为the boys,与ask之间为被动关系,故用过去分词作状语。句意:当问到谁是他们最好的朋友,男孩们回答之前通常犹豫。
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