---What about conference you attended last week?-To tell the truth it was too boring

问题补充：

---What about conference you attended last week?

---To tell the truth, it was too boring, you know, conference like that.

A. a, the

B. the, /

C. the, a

D. the, the

答案：

A. a, the

B. the, /

(答案→)C. the, a

D. the, the

解析：考查冠词.上文根据后面定语从句可知为特指,用定冠词.下文那样的一个会议,为泛指,用不定冠词,故选C.