What a strange man!He loves his wife, but he often beats her． [ ] A．at a time B．

解析：at the same time“同时”；at a time“一次”；at one time“曾经，一度”。in time“及时；终究”。

拓展：例如：I can eat thirty dumplings at a time．我一次能吃三十个饺子。I lived in the country at one time．我曾在乡下住过。He'll succeed in time．他终究会成功。