Could it be in the classroom we had a talk last night you left your keys?A. that; whereB.

Could it be in the classroom we had a talk last night you left your keys?
A. that; where
B. in which; where
C. where; that
D. where; in which

A. that; whereB. in which; where(答案→)C. where; thatD. where; in which解析：考查强调句与定语从句的混合使用。第二个为强调句的后半部分，可以通过去掉it could be 和that来验证；第二格先行词在定语从句中作地点状语，故用where。选C。

这个答案应该是对的