Question

【题目】

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

A. which

B. when

C. what

D. that

Answer 1

【答案】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。