-Where did you find the professor who made the speech yesterday?It was in the hall

---Where did you find the professor who made the speech yesterday?
--- It was in the hall the students often have a meeting.
A. Where
B. which
C. that
D. when

(答案→)A. WhereB. whichC. thatD. when解析： 考察定语从句和强调句型。本题中先行词是the hall，后面的where the students often have a meeting是一个定语从句，因为句子结构嗯完整，所以使用关系副词where。在句中后面还省略了I found the professor who made the speech yesterday.句义：—你是在哪里找到昨天发言的那位教授的？—就是在学生们经常开会的大厅里我找到了他。故A正确。定语从句的关键在于分析句子结构，定语从句中如果既不缺主语，也不缺宾语和表语，就要考虑是否用关系副词或whose作定语，意为“谁的”。至于如何判断缺不缺主或是宾语，尤其是缺宾语的情况，要将先行词带到定从中谓语动词之后看是否符合逻辑搭配，如符合则缺宾语，如不符合就不缺。同时强调句型在高考中每年必出，关键是要会判断，平时练习时要有这个意识。it is /was+被强调部分+that/who+…判断方法是去掉it is /was that/who句子不缺成分，即为强调句型。

哦，回答的不错