By 16:30. was almost closing time, nearly all the paintings had been sold.A. which B. whenC. what D.

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【题目】By 16:30，__________ was almost closing time, nearly all the paintings had been sold.

A. which B. when

C. what D. that

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【答案】A

【解析】

考查定语从句。which引导非限制性定语从句，代指先行词16:30，作定语从句的主语。