--So you know Catherine?
---Yes, it was last week she came to visit my roommate Jane.
A. that
B. when
C. since
D. before
网友回答
A. that
(答案→)B. when
C. since
D. before
解析：考查强调句型。本题是强调句型，强调句型的基本结构为It is/was被强调成分that/who其它成分；其最大的特点就是去掉it is/was…that/who…句子仍然成立。本句强调的是时间状语last week。句意：就是在上个星期她来看我的室友Jane的时候，我们认识的。故B正确。