What a strange man! He loves his wife, but _________ he ofte
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答案D

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.