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

问题补充：

if he had any difficulties, he made no answer.

A. Ask

B. To ask

C. Asked

D. Asking

答案：

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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