—Do you know they got to know each other?—It was last year they both taught Chinese in Sc

—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→)A. When it was that, whenB. when it was that, whileC. When it was that, thatD. When it was that, as解析：考查强调句型的特殊疑问句形式及定语从句。Know后面接一个宾语从句，故第一空应用陈述语序 When it was that，答语是一个强调句型，省略了that they got to know each other，第二空中last year后面引导一个定语从句，从句主干完整，故last year在从句中做状语，使用关系副词when.句意：——你知道是在什么时候他们相互认识的？——那是在去年，他们都在苏格兰教汉语的时候认识的

这个问题我还想问问老师呢