if he had any difficulties, he made no answer. A. AskB. To ask C. AskedD. Asking

发布时间：2020-08-17 14:21:36

     if he had any difficulties, he made no answer.
A. Ask
B. To ask
C. Asked
D. Asking

网友回答

A. Ask
B. To ask
C. Asked
D. Asking
解析：句子的主语是he，asked作时间状语，表示“当他被问到的时候”。
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