Question

Could it be in the room _________ we had a talk last night ___________ you left your keys ?

A. that; where B. in which; where C. where ; that D. where ; where

Answer 1

答案： C
如若改成陈述句，即： You left your keys in the room where we had a talk last night.

改成强调句It is / was + 被强调部分+ that +句子剩余部分， 强调地点状语部分，即： It was / could be in the room where we had a talk last night that you left your keys.
再改为一般疑问句的话，则是你所给的题目了。

希望能帮助到你，祝学习愉快！

Answer 2

选A。
两处全都是表示地点的，in the room里面已经有 in 了，所以用that 即可（表时间、地点、方式、程度等等的副词用作关系代词时，相当于 介词 + which/that ，这里面的介词就是 in ），其实就是 we had a talk in the room last night。第二处直接用where表示地点: left your keys in the room。

Answer 3

已收到你的求助，答案选【C】
这里考察两个语法点
【1】定语从句
【2】It's ···that···的强调句
首先 将疑问句改为陈述句来看
It could be in the room where we had a talk last night that you left your keys。

然后划分出强调句型
【It could be】 in the room where we had a talk last night 【that】 you left your keys。

再然后分析定语从句
the room where we had a talk last night

这里从句完整，we【主语】 had 【谓语】a talk【宾语】 last night【时间状语】
缺少【地点状语】，故采用where或者in which都是可以的，两者等价（关系副词=关系代词+介词）
希望帮助到了你！

Answer 4

你好！
这道题答案是：D 考查强调句结构。为更好辨识语句结构，可以将题干做一变化
即：It could be in the room （where we had a talk last night） you left your key.其中where we had a talk last night为定语从句修饰room
考查的结构是：It could be in the room you left your key?就很容易看出是强调句。
小马过河为您解答！~
祝您学习愉快！~