to make a speech he said he would be glad to.A. When askedB. When askingC. When he was a

问题补充：

to make a speech, he said he would be glad to.

A. When asked

B. When asking

C. When he was asking

D. When to ask

答案：

(答案→)A. When asked

B. When asking

C. When he was asking

D. When to ask

解析：考查状语从句的省略，在含有状语从句的复合句中，若从句的主句是it或与主句的主语相同，且在谓语中含有be时，常省略从句的主语和be。句子意思：当他被要求做演讲时，他说他会很乐意的。完整的句子是When he was asked to make a speech, he said he would be glad to.主从句的主语都是he，可以省略从句的主语和be动词，剩下asked，选A。