Question

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

Answer 1

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。