![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
______ , he refused to give any explanation.
A.
When asked to comment on the quality of the goods
B.
When he being asked to comment on the quality of the goods
C.
When asking to comment on the quality of the goods
D.
When he asked to comment on the quality of the goods