问题补充：
---- Do you know they got to know each other?
---- It was last year they both taught Chinese in Scotland.
A. When it was that, when
B. when it was that, while
C. When it was that, that
D. When it was that, as
答案：
(答案→)A. When it was that, when
B. when it was that, while
C. When it was that, that
D. When it was that, as
解析：
试题分析:考查强调句型。从结构可知know后面是宾语从句，从句要用陈述语序，所以排除B、D选项，根据语境可知答语是省略了that部分的强调句型，last year后是定语从句，所以A选项正确。句意：---你知道他们是什么时候彼此认识的吗？--那是去年他们在苏格兰教汉语的时候。
