By 16∶30， was almost closing time，nearly all the paintings had been sold.
(2012·江西，28)
A. which
B. when
C. what
D. that
网友回答
A. which
B. when
C. what
D. that
解析：A
解析 从后面的closing time“打烊时间，停止营业时间”可以得知此句是在谈时间，但是此句中缺少主语，前面又有一个逗号，所以可以确定这里是一个非限制性定语从句，用which引导。