(2013·武威模拟)I have learned from my bitter experience we don’t know
we’ve got until it’s gone.
A. that; that
B. what; what
C. that; what
D. which; that
网友回答
A. that; that
B. what; what
C. that; what
D. which; that
解析：选C。考查名词性从句。第一空后的从句是动词learned的宾语; 且learned后的从句结构完整, 用that; 第二空know后的从句缺少宾语要用what, 所以选C。