--So you know Catherine?---Yes it was last week she came to visit my roommate Jane.A. tha

问题补充：

--So you know Catherine?

---Yes, it was last week she came to visit my roommate Jane.

A. that

B. when

C. since

D. before

答案：

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。