题目：
I have learned from my bitter experience we don’t know we’ve got until it’s gone.
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答案：
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。
I have learned from my bitter experience we don’t know we’ve got until it’s gone.
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