When who is their best friends, the boys usually hesitate before responding.A. askingB. a

发布时间：2020-08-16 14:16:36


When      who is their best friends, the boys usually hesitate before responding.
A. asking
B. asked
C. ask
D. to ask

网友回答

A. asking
(答案→)B. asked
C. ask
D. to ask
解析：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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