题目内容


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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