Question

4. He claims        in the supermarket when he was doing shopping yesterday.

(treat)

他声称昨天在超市购物时受到不公正对待。

Answer 1

4. to have been badly/unfairly treated/that he was badly/unfairly treated claim后可跟不定式或从句结构;从时态语态的要求看，应用不定式的完成时和被动语态。