单选题 --Were they late for the play?
--Not really. As soon as they ______ themselves in their seats in the theatre, the curtain

【正确答案】 A
【答案解析】句意为:一他们看戏去晚了吗?
—实际上没有晚,他们一找到座位大幕就拉开了。
这道题就是考查as soon as这个词组的用法,他表示“一……就……”,go up是表动作,“爬上,登上”,不能做完成式。