mydearfriend

去掉插入语 my dear friend 分析

don't you knowit is you that she loves

that 引导宾语从句，且不在从句中充当成分，而其他三个在从句中都要做成分，it is you that she loves是强调句，去掉强调结构 she loves you 从句中成分完整，所以选择that